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30/09/2025

SANTé/MEDECINE - La grossesse mois par mois - 2ème mois


L'embryon au cours du deuxième mois de grossesse

Le développement de l'embryon se fait rapidement. Ses bras et ses jambes se forment. Son visage se dessine. Les deux hémisphères cérébraux sont bien formés, ainsi que l'estomac, le pancréas et le foie. L'embryon découvre l'odorat.

À la sixième semaine de grossesse, le sexe est déterminé (bien qu'il ne soit pas encore visible). L'embryon mesure entre 10 et 14 millimètres, la différence avec le premier mois est bien visible ! Il grandira encore beaucoup jusqu'à atteindre 3 centimètres à la huitième semaine.

Vient ensuite la formation des yeux, des doigts et des orteils.

À la fin des huit premières semaines tous ses organes sont en place.

FuturaSciences

ASTRONOMY - Comet Lemmon Brightens

 2025 September 30

A starfield is shown that has a bright comet.
The comet shows a green head on the lower left and
an ion tail with significant structure extending out
to the upper right. 
Please see the explanation for more detailed information.

Comet Lemmon Brightens
Image Credit & Copyright: Victor Sabet & Julien De Winter

Explanation: Comet Lemmon is brightening and moving into morning northern skies. Besides Comet SWAN25B and Comet ATLASComet C/2025 A6 (Lemmon) is now the third comet currently visible with binoculars and on long camera exposures. Comet Lemmon was discovered early this year and is still headed into the inner Solar System. The comet will round the Sun on November 8, but first it will pass its nearest to the Earth -- at about half the Earth-Sun distance -- on October 21. Although the brightnesses of comets are notoriously hard to predict, optimistic estimates have Comet Lemmon then becoming visible to the unaided eye. The comet should be best seen in predawn skies until mid-October, when it also becomes visible in evening skies. The featured image showing the comet's split and rapidly changing ion tail was taken in TexasUSA late last week.

29/09/2025

ASTRONOMY - Two Camera Comets in One Sky

2025 September 29
A starfield is shown that has two short streaks 
running diagonally.  At closer inspection, they are 
two comets both with white-green heads and white
tails. 
Please see the explanation for more detailed information.

Two Camera Comets in One Sky
Image Credit & Copyright: Luc Perrot (TWAN)

Explanation: It may look like these comets are racing, but they are not. Comets C/2025 K1 ATLAS (left) and C/2025 R2 SWAN (right) appeared near each other by chance last week in the featured image taken from France's Reunion Island in the southern Indian Ocean. Fainter Comet ATLAS is approaching our Sun and will reach its closest approach in early October when it is also expected to be its brightest -- although still only likely visible with long exposures on a camera. The brighter comet, nicknamed SWAN25B, is now headed away from our Sun, although its closest approach to Earth is expected in mid-October, when optimistic estimates have it becoming bright enough to see with the unaided eye. Each comet has a greenish coma of expelled gas and an ion tail pointing away from the Sun. 

28/09/2025

ASTRONOMY - Nebulas and Clusters in Sagittarius

 2025 September 17

A starfield surrounds a several large nebulas
that appear mostly red but also white and blue.
Dark dust and blue filaments also populate the frame. 
Please see the explanation for more detailed information.

Nebulas and Clusters in Sagittarius
Image Credit & Copyright: J. De WinterC. HumbertC. Robert & V. Sabet; Text: Ogetay Kayali (MTU)

Explanation: Can you spot famous celestial objects in this image? 18th-century astronomer Charles Messier cataloged only two of them: the bright Lagoon Nebula (M8) at the bottom, and the colorful Trifid Nebula (M20) at the upper right. The one on the left that resembles a cat's paw is NGC 6559, and it is much fainter than the other two. Even harder to spot are the thin blue filaments on the left, from supernova remnant (SNR G007.5-01.7). Their glow comes from small amounts of glowing oxygen atoms that are so faint that it took over 17 hours of exposure with just one blue color to bring up. Framing this scene of stellar birth and death are two star clusters: the open cluster M21 just above Trifid, and the globular cluster NGC 6544 at lower left.

MUSIQUE - Camille Saint-Saens - Danse macabre

"Danse macabre"

27/09/2025

ASTRONOMY - A Rocket in the Sun

2025 September 27
See Explanation.  Clicking on the picture will download
the highest resolution version available.

A Rocket in the Sun
Image Credit & Copyright: Pascal Fouquet

Explanation: On the morning of September 24 a rocket crosses the bright solar disk in this long range telescopic snapshot captured from Orlando, Florida. That's about 50 miles north of its Kennedy Space Center launch site. This rocket carried three new space weather missions to space. Signals have now been successfully acquired from all three - NASA's Interstellar Mapping and Acceleration Probe, NASA’s Carruthers Geocorona Observatory, and the National Oceanic and Atmospheric Administration (NOAA) Space Weather Follow-On Lagrange 1 (SWFO-L1) - as they begin their journey to L1, an Earth-Sun lagrange point. L1 is about 1.5 million kilometers in the sunward direction from planet Earth. Appropriately, major space weather influencers, aka dark sunspots in active regions across the Sun, are posing with the transiting rocket. In fact, large active region AR4225 is just right of the rocket's nose. 

26/09/2025

ASTRONOMY - A SWAN, an ATLAS, and Mars

 2025 September 26

See Explanation.  Clicking on the picture will download
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A SWAN, an ATLAS, and Mars
Image Credit & Copyright: Adam Block

Explanation: A new visitor to the inner Solar System, comet C/2025 R2 (SWAN) sports a long ion tail extending diagonally across this almost 7 degree wide telescopic field of view recorded on September 21. A fainter fellow comet also making its inner Solar System debut, C/2025 K1 (ATLAS), can be spotted above and left of SWAN's greenish coma, just visible against the background sea of stars in the constellation Virgo. Both new comets were only discovered in 2025 and are joined in this celestial frame by ruddy planet Mars (bottom), a more familiar wanderer in planet Earth's night skies. The comets may appear to be in a race, nearly neck and neck in their voyage through the inner Solar System and around the Sun. But this comet SWAN has already reached its perihelion or closest approach to the Sun on September 12 and is now outbound along its orbit. This comet ATLAS is still inbound though, and will make its perihelion passage on October 8.

OCEANOGRAPHIE - Les vagues scélérates - Le jour où l'océan a riposté

Le jour de l'An 1995, une vague scélérate de 24 mètres (80 pieds) s'est abattue sur la plate-forme pétrolière Draupner en mer du Nord, tordant les garde-corps en acier et projetant du matériel lourd à travers le pont.

©Getty Images

25/09/2025

ASTRONOMY - Saturn Opposite the Sun

 2025 September 25

See Explanation.  Clicking on the picture will download
the highest resolution version available.

Saturn Opposite the Sun
Image Credit & Copyright: Jin Wang

Explanation: This year Saturn was at opposition on September 21, opposite the Sun in planet Earth's sky. At its closest to Earth, Saturn was also at its brightest of the year, rising as the Sun set and shining above the horizon all night long among the fainter stars of the constellation Pisces. In this snapshot from the Qinghai Lenghu Observatory, Tibetan Plateau, southwestern China, the outer planet is immersed in a faint, diffuse oval of light known as the gegenschein or counter glow. The diffuse gegenschein is produced by sunlight backscattered by interplanetary dust along the Solar System's ecliptic plane, opposite the Sun in planet Earth's sky. Like a giant eye, on this dark night Saturn and gegenschein seem to stare down on the observatory's telescope domes from their antisolar perspective. Strong, atmospheric airglow forms a colorful background along the horizon.

24/09/2025

ASTRONOMY - GW250114: Rotating Black Holes Collide

 2025 September 24

Artwork depicts a colorful version of two black 
holes nearing collision from between the black holes.
Swirling gas is depicted with wavey lined depicting
gravitational waves ringing and an artificial grid
depicting spacetime shown distorting. 
Please see the explanation for more detailed information.

GW250114: Rotating Black Holes Collide
Illustration Credit: Aurore Simonnet (SSU/EdEon), LVK, URI; LIGO Collaboration

Explanation: It was the strongest gravitational wave signal yet measured -- what did it show? GW250114 was detected by both arms of the Laser Interferometer Gravitational-wave Observatory (LIGO) in Washington and Louisiana USA earlier this year. Analysis showed that the event was created when two black holes, each of mass around 33 times the mass of the Sun, coalesced into one larger black hole with a mass of around 63 solar masses. Even though the event happened about a billion light years away, the signal was so strong that the spin of all black holes, as well as initial ringing of the final black hole, was deduced with exceptional accuracy. Furthermore, it was confirmed better than before, as previously predicted, that the total event horizon area of the combined black hole was greater than those of the merging black holes. Featured, an artist's illustration depicts an imaginative and conceptual view from near one of the black holes before collision.

23/09/2025

OCEANOGRAPHIE - Les vagues scélérates - Hollywood versus la réalité (2/29)

Dans le film catastrophe "Poséidon" sorti en 2006, un paquebot de luxe est renversé par une énorme vague scélérate, obligeant les passagers à lutter pour leur survie. Si Hollywood exagère le côté dramatique, ces vagues géantes représentent un danger bien réel en pleine mer.

©NL Beeld

ASTRONOMY - NGC 6357: Cathedral to Massive Stars

2025 September 23
Stars dot the frame that has a blue background.
Covering the lower part of the image, and the far
right, are brown and tan nebular structures.  
Please see the explanation for more detailed information.

NGC 6357: Cathedral to Massive Stars
Image Credit: NASAESACSASTScIJWST; Processing: Alyssa Pagan (STScI);
Rollover: NASAESAHST, & J. M. Apellániz (IAA, Spain); Acknowledgement: D. De Martin (ESA/Hubble)

Explanation: How massive can a normal star be? Estimates made from distance, brightness and standard solar models had given one star in the open cluster Pismis 24 over 200 times the mass of our Sun, making it one of the most massive stars known. This star is the brightest object located in the central cavity near the bottom center of the featured image taken with the Webb Space Telescope in infrared light. For comparison, a rollover image from the Hubble Space Telescope is also featured in visible light. Close inspection of the images, however, has shown that Pismis 24-1 derives its brilliant luminosity not from a single star but from three at least. Component stars would still remain near 100 solar masses, making them among the more massive stars currently on record. Toward the bottom of the image, stars are still forming in the associated emission nebula NGC 6357. Appearing perhaps like a Gothic cathedral, energetic stars near the center appear to be breaking out and illuminating a spectacular cocoon

22/09/2025

SANTé/MEDECINE - La grossesse mois par mois

Lors du premier mois de grossesse, la formation de l'embryon commence. Ici, un embryon à huit cellules. © Deva Studio, Shutterstock

Les quatre premières semaines de grossesse

Le premier mois de grossesse correspond à la phase de développement embryonnaire, durant laquelle a lieu la segmentation puis la nidation. À la troisième semaine, l'œuf mesure 3 millimètres. Il s'installe sur la muqueuse utérine.

L'embryon commence à se former, notamment le cœur, qui commence à battre vers la quatrième semaine. C'est lors de cette quatrième semaine que le développement s'accélère. Le cordon ombilical se forme.

Les signes de la grossesse

Du côté de la maman, les œstrogènes et la progestérone, des hormones qui l'accompagneront durant toute la grossesse, ont déjà commencé leur travail. Très vite la poitrine va prendre du volume et devenir plus ferme, les mamelons vont se foncer et s'élargir. Il est possible de ressentir une somnolence et des nausées.

FuturaSciences

ASTRONOMY - Equinox at Saturn

 2025 September 22

The planet Saturn is pictured 6 times in a horizonal
column, labelled by years with 2020 at the top and
2025 at the bottom. As the years progress, Saturn's
ring appear less prominent. 
Please see the explanation for more detailed information.

Equinox at Saturn
Image Credit & Copyright: Imran Sultan

Explanation: On Saturn, the rings tell you the season. On Earth, today marks an equinox, the time when the Earth's equator tilts directly toward the Sun. Since Saturn's grand rings orbit along the planet's equator, these rings appear most prominent -- from the direction of the Sun -- when the spin axis of Saturn points toward the Sun. Conversely, when Saturn's spin axis points to the side, an equinox occurs, and the edge-on rings are hard to see from not only the Sun -- but Earth. In the featured montage, images of Saturn between the years of 2020 and 2025 have been superposed to show the giant planet passing, with this year's equinox, from summer in the north to summer in the south. Yesterday, Saturn was coincidently about as close as it gets to planet Earth, and so this month the ringed giant's orb is relatively bright and visible throughout the night.

21/09/2025

ASTRONOMY - Equinox Sunset

2025 September 21
A city skyline is shown behind some hills and a river.
The path of the Sun is shown for several times during a year.
Please see the explanation for more detailed information.

Equinox Sunset
Image Credit: Luca Vanzella

Explanation: Does the Sun set in the same direction every day? No, the direction of sunset depends on the time of the year. Although the Sun always sets approximately toward the west, on an equinox like tomorrow the Sun sets directly toward the west. After tomorrow's September equinox, the Sun will set increasingly toward the southwest, reaching its maximum displacement at the December solstice. Before tomorrow's September equinox, the Sun had set toward the northwest, reaching its maximum displacement at the June solstice. The featured time-lapse image shows seven bands of the Sun setting one day each month from 2019 December through 2020 June. These image sequences were taken from AlbertaCanada -- well north of the Earth's equator -- and feature the city of Edmonton in the foreground. The middle band shows the Sun setting during an equinox -- in March. From this location, the Sun will set along this same equinox band again tomorrow. 

MUSIC - Antonio Vivaldi - Four Seasons *Autumn* - Frederieke Saeijs

OCEANOGRAPHIE - Les scientifiques expliquent enfin le mystère des vagues scélérates (1/29)

Autrefois considérées comme des légendes maritimes, les vagues scélérates sont devenues une réalité scientifique en 1995, lorsqu'un mur d'eau de 24 mètres (80 pieds) de haut a frappé la plate-forme pétrolière Draupner. De nouvelles études montrent que ces vagues extrêmes se forment lorsque des phénomènes océaniques ordinaires, tels que l'alignement ou l'étirement irrégulier des vagues, convergent au mauvais moment. À partir de données recueillies en mer du Nord, les chercheurs ont confirmé que les vagues scélérates résultent de phénomènes physiques courants. Des modèles sont actuellement développés afin de pouvoir un jour aider à prévoir ces dangers soudains et gigantesques.

©Getty Images

(à suivre)

20/09/2025

ASTRONOMY - Gibbous vs Crescent

 2025 September 20

See Explanation.  Clicking on the picture will download
the highest resolution version available.

Gibbous vs Crescent
Image Credit & Copyright: Luca Bartek

Explanation: Early risers around planet Earth have enjoyed a shining crescent Moon near brilliant Venus, close to the eastern horizon in recent morning twilight skies. And yesterday, on September 19, skygazers watching from some locations in Earth's northern hemisphere were also able to witness Venus, in the inner planet's waxing gibbous phase, pass behind the Moon's waning crescent. In fact, this telescopic snapshot was taken moments before that occultation of gibbous Venus by the crescent Moon began. The close-up view of the beautiful celestial alignment records Venus approaching part of the Moon's sunlit edge in clear daytime skies from the Swiss Alps. Tomorrow, the Sun will pass behind a New Moon. But to witness that partial solar eclipse on September 21, skygazers will need to watch from locations in planet Earth's southern hemisphere.

19/09/2025

ASTRONOMY - Galaxies Stars and Dust

 2025 August 28

See Explanation.  Clicking on the picture will download
the highest resolution version available.

Galaxies, Stars, and Dust
Image Credit & Copyright: Robert Eder

Explanation: This well-composed telescopic field of view covers over a Full Moon on the sky toward the high-flying constellation Pegasus. Of course the brighter stars show diffraction spikes, the commonly seen effect of internal supports in reflecting telescopes, and lie well within our own Milky Way galaxy. The faint but pervasive clouds of interstellar dust ride above the galactic plane and dimly reflect the Milky Way's starlight. Known as galactic cirrus or integrated flux nebulae they are associated with the Milky Way's molecular clouds. In fact, the diffuse cloud cataloged as MBM 54, less than a thousand light-years distant, fills the scene. The galaxy seemingly tangled in the dusty cloud is the striking spiral galaxy NGC 7497. It's some 60 million light-years away, though. Seen almost edge-on near the center of the field, NGC 7497's own spiral arms and dust lanes echo the colors of stars and dust in our own Milky Way.

LES BELLES INVENTIONS DE LEONARD DE VINCI - Léonard de Vinci a revisité la catapulte


Bien que condamnant la guerre, Léonard de Vinci a passé beaucoup de temps à concevoir et dessiner des armes. Comme en témoigne le Codex Atlanticus, il était tout particulièrement fasciné par les catapultes.

Ici, une représentation d'un des dessins qu'il a fait à ce sujet. Il ne s'agit en rien d'une invention car ces armes étaient connues depuis l'Antiquité, mais Léonard y apporte sa touche esthétique si caractéristique.

© Catalogo collezioni, CC by-sa 4.0

18/09/2025

ASTRONOMY - Comet C/2025 R2 (SWAN)

2025 September 18
See Explanation.  Clicking on the picture will download
the highest resolution version available.

Comet C/2025 R2 (SWAN)
Image Credit & Copyright: Team Ciel Austral

Explanation: A new visitor from the outer Solar System, comet C/2025 R2 (SWAN) also known as SWAN25B was only discovered late last week, on September 11. That's just day before the comet reached perihelion, its closest approach to the Sun. First spotted by Vladimir Bezugly in images from the SWAN instrument on the sun-staring SOHO spacecraft, the comet was surprisingly bright but understandably difficult to see against the Sun's glare. Still close to the Sun on the sky, the greenish coma and tail of C/2025 R2 (SWAN) are captured in this telescopic snapshot from September 17. Spica, alpha star of the constellation Virgo, shines just beyond the upper left edge of the frame while the comet is about 6.5 light-minutes from planet Earth. Near the western horizon after sunset and slightly easier to see in binoculars from the southern hemisphere, this comet SWAN will pass near Zubenelgenubi, alpha star of Libra, on October 2. C/2025 R2 (SWAN) is scheduled to make its closest approach to our fair planet around October 20. 

17/09/2025

ASTRONOMY - Nebulas and Clusters in Sagittarius

 2025 September 17

A starfield surrounds a several large nebulas
that appear mostly red but also white and blue.
Dark dust and blue filaments also populate the frame. 
Please see the explanation for more detailed information.

Nebulas and Clusters in Sagittarius
Image Credit & Copyright: J. De WinterC. HumbertC. Robert & V. Sabet; Text: Ogetay Kayali (MTU)

Explanation: Can you spot famous celestial objects in this image? 18th-century astronomer Charles Messier cataloged only two of them: the bright Lagoon Nebula (M8) at the bottom, and the colorful Trifid Nebula (M20) at the upper right. The one on the left that resembles a cat's paw is NGC 6559, and it is much fainter than the other two. Even harder to spot are the thin blue filaments on the left, from supernova remnant (SNR G007.5-01.7). Their glow comes from small amounts of glowing oxygen atoms that are so faint that it took over 17 hours of exposure with just one blue color to bring up. Framing this scene of stellar birth and death are two star clusters: the open cluster M21 just above Trifid, and the globular cluster NGC 6544 at lower left.

16/09/2025

ASTRONOMY - New Comet SWAN25B over Mexico

 2025 September 16

A starfield is seen above a horizon and an
orange sunset. In the starfield, near the horizon,
is a comet with a green head and long tail.
Please see the explanation for more detailed information.

New Comet SWAN25B over Mexico
Image Credit & Copyright: Daniel Korona

Explanation: A newly discovered comet is already visible with binoculars. The comet, C/2025 R2 (SWAN) and nicknamed SWAN25B, is brightening significantly as it emerges from the Sun's direction and might soon become visible on your smartphone -- if not your eyes. Although the brightnesses of comets are notoriously hard to predict, many comets appear brighter as they approach the Earth, with SWAN25B reaching only a quarter of the Earth-Sun distance near October 19. Nighttime skygazers will also be watching for a SWAN25B-spawned meteor shower around October 5 when our Earth passes through the plane of the comet's orbit. The unexpectedly bright comet was discovered by an amateur astronomer in images of the SWAN instrument on NASA's SOHO satellite. The comet is currently best observed in southern skies but is slowly moving north. The featured image was captured at sunset three days ago just above the western horizon in ZacatecasMexico.

15/09/2025

ASTRONOMY - Earth During a Powerful Solar Storm

2025 september 15

Earth During a Powerful Solar Storm
Video Credit: NASA's SVSSWRCCCMCSWMFT. Bridgeman et al.

Explanation: Can our Sun become dangerous? Yes, sometimes. Every few years our Sun ejects a scary-large bubble of hot gas into the Solar System. Every hundred years or so, when the timing, location, and magnetic field connections are just right, such a Coronal Mass Ejection (CME) will hit the Earth. When this happens, the Earth not only experiences dramatic auroras, but its magnetic field gets quickly pushed back and compressed, which causes electric grids to surge. Some of these surges could be dangerous, affecting satellites and knocking out power grids -- which can take months to fix. Just such a storm -- called the Carrington Event -- occurred in 1859 and caused telegraph wires to spark. A similar CME passed near the Earth in 2012, and the featured animated video shows a computer model of what might have happened if it had been a direct hit. In this model, the Earth's magnetopause becomes so compressed that it went inside the orbit of geosynchronous communication satellites.

LES BELLES INVENTIONS DE LEONARD DE VINCI - Un des pionniers du parachute


Il est difficile de dire si Léonard de Vinci est bien le premier à avoir inventé le parachute mais il est certainement un des pionniers de ce concept du point de vue scientifique.

Le dessin en arrière-plan est extrait du Codex Atlanticus, un recueil de dessins et de notes de Léonard de Vinci conservé à la bibliothèque Ambrosienne de Milan. Le dessin a probablement été réalisé entre 1485 et 1502.

© Nevit Dilmen, CC by-sa 3.0

14/09/2025

ASTRONOMY - Planets of the Solar System: Tilts and Spins

 2025 September 14

Planets of the Solar System: Tilts and Spins
Video Credit: NASAAnimation: James O'Donoghue (U. Reading)

Explanation: How does your favorite planet spin? Does it spin rapidly around a nearly vertical axis, or horizontally, or backwards? The featured video animates NASA images of all eight planets in our Solar System to show them spinning side-by-side for an easy comparison. In the time-lapse video, a day on Earth -- one Earth rotation -- takes just a few seconds. Jupiter rotates the fastest, while Venus spins not only the slowest (can you see it?), but backwards. The inner rocky planets across the top underwent dramatic spin-altering collisions during the early days of the Solar System. Why planets spin and tilt as they do remains a topic of research with much insight gained from modern computer modeling and the recent discovery and analysis of hundreds of exoplanets: planets orbiting other stars.

13/09/2025

ASTRONOMY - Star Trails over One-Mile Radio Telescope

 2025 September 13

See Explanation.  Clicking on the picture will download
the highest resolution version available.

Star Trails over One-Mile Radio Telescope
Image Credit & Copyright: Joao Yordanov Serralheiro

Explanation: The steerable 60 foot diameter dish antenna of the One-Mile Telescope at Mullard Radio Astronomy Observatory, Cambridge, UK, is pointing skyward in this evocative night-skyscape. To capture the dramatic scene, consecutive 30 second exposures were recorded over a period of 90 minutes. Combined, the exposures reveal a background of gracefully arcing star trails that reflect planet Earth's daily rotation on its axis. The North Celestial Pole, the extension of Earth's axis of rotation into space, points near Polaris, the North Star. That's the bright star that creates the short trail near the center of the concentric arcs. But the historic One-Mile Telescope array also relied on planet Earth's rotation to operate. Exploring the universe at radio wavelengths, it was the first radio telescope to use Earth-rotation aperture synthesis. That technique uses the rotation of the Earth to change the relative orientation of the telescope array and celestial radio sources to create radio maps of the sky at a resolution better than that of the human eye.

12/09/2025

ASTRONOMY - Lunar Eclipse in Two Hemispheres

 2025 September 12

See Explanation.  Clicking on the picture will download
the highest resolution version available.

Lunar Eclipse in Two Hemispheres
Image Credit & Copyright: North - Zhouyue ZhuSouth - Lucy Yunxi Hu

Explanation: September's total lunar eclipse is tracked across night skies from both the northern and southern hemispheres of planet Earth in these two dramatic timelapse series. In the northern hemisphere sequence (top panel) the Moon’s trail arcs from the upper left to the lower right. It passes below bright planet Saturn, seen under mostly clear skies from the international campus of Zhejiang University in China at about 30 degrees north latitude. In contrast, the southern hemisphere view from Lake Griffin, Canberra, Australia at 35 degrees south latitude, records the Moon’s trail from the upper right to the lower left. Multiple lightning flashes from thunderstorms near the horizon appear reflected in the lake. Both sequences were photographed with 16mm wide-angle lenses and both cover the entire eclipse, with the darkened red Moon totally immersed in Earth's umbral shadow near center. But the different orientations of the Moon’s path across the sky reveal the perspective shifts caused by the views from northern vs. southern latitudes.

SANTé/MEDECINE - Remèdes de Grand-mère - Dépuratif du foie

À jeun, dès votre réveil, avalez 1 cuillère à soupe d'huile d'olive "première pression à froid". Pour faciliter l'ingestion de l'huile d'olive, ajoutez quelques gouttes de jus de citron pressé dans la cuillère. 

Sachez que les mauvais aliments pour le foie sont ceux qui ont une haute teneur en graisse, les sauces grasses, les fritures, les pâtisseries et l'alcool. 

Les bons aliments pour le foie sont les artichauts et les pissenlits qui ont le pouvoir de désintoxiquer un foie irrité. Et si vous cherchez les "légumes-miracles" pour le foie, tournez-vous vers les carottes, le cresson, toutes les salades (même cuites), les tomates et les olives. Certains fruits ont aussi des bienfaits sur le foie comme les agrumes, le raisin sec et les pommes.

CommentEconomiser

11/09/2025

ASTRONOMY - The Umbra of Earth

2025 September 11
See Explanation.  Clicking on the picture will download
the highest resolution version available.

The Umbra of Earth
Image Credit & Copyright: Wang Letian (Eyes at Night)

Explanation: The dark, inner shadow of planet Earth is called the umbra. Shaped like a cone extending into space, it has a circular cross section most easily seen during a lunar eclipse. And on the night of September 7/8 the Full Moon passed near the center of Earth's umbral cone, entertaining eclipse watchers around much of our fair planet, including parts of Antarctica, Australia, Asia, Europe, and Africa. Recorded from Zhangjiakou City, China, this timelapse composite image uses successive pictures from the total lunar eclipse, progressing left to right, to reveal the curved cross-section of the umbral shadow sliding across the Moon. Sunlight scattered by the atmosphere into Earth's umbra causes the lunar surface to appear reddened during totality. But close to the umbra's edge, the limb of the eclipsed Moon shows a distinct blue hue. The blue eclipsed moonlight originates as rays of sunlight pass through layers high in the upper stratosphere, colored by ozone that scatters red light and transmits blue. In the total phase of this leisurely lunar eclipse, the Moon was completely within the Earth's umbra for about 83 minutes. 

10/09/2025

ASTRONOMY - IRAS 04302: Butterfly Disk Planet Formation

 2025 September 8

A starfield surrounds a nebula with a vertical brown bar
across its center. Gas and dust fan out from the bar
making the nebula appear like a colorful butterfly. 
Please see the explanation for more detailed information.

IRAS 04302: Butterfly Disk Planet Formation
Image Credit: NASAESACSAWebb; Processing: M. Villenave et al.

Explanation: This butterfly can hatch planets. The nebula fanning out from the star IRAS 04302+2247 may look like the wings of a butterfly, while the vertical brown stripe down the center may look like the butterfly's body -- but together they indicate an active planet-forming system. The featured picture was captured recently in infrared light by the Webb Space Telescope. Pictured, the vertical disk is thick with the gas and dust from which planets form. The disk shades visible and (most) infrared light from the central star, allowing a good view of the surrounding dust that reflects out light. In the next few million years, the dust disk will likely fragment into rings through the gravity of newly hatched planets. And a billion years from now, the remaining gas and dust will likely dissipate, leaving mainly the planets -- like in our Solar System.

09/09/2025

ASTRONOMY - Up from the Earth: Gigantic Jet Lightning

2025 September 9
An image of Earth from space shows an unusual 
multi-colored jet in the middle of the frame.  
Please see the explanation for more detailed information.

Up from the Earth: Gigantic Jet Lightning
Image Credit: NASAExpedition 73Nicole Ayers

Explanation: What's that rising up from the Earth? When circling the Earth on the International Space Station early in July, astronaut Nicole Ayers saw an unusual type of lightning rising up from the Earth: a gigantic jet. The powerful jet appears near the center of the featured image in red, white, and blue. Giant jet lightning has only been known about for the past 25 years. The atmospheric jets are associated with thunderstorms and extend upwards towards Earth's ionosphere. The lower part of the frame shows the Earth at night, with Earth's thin atmosphere tinted green from airglow. City lights are visible, sometimes resolved, but usually creating diffuse white glows in intervening clouds. The top of the frame reveals distant stars in the dark night sky. The nature of gigantic jets and their possible association with other types of Transient Luminous Events (TLEs) such as blue jets and red sprites remain active topics of research

ASTRONOMIE - Lune de sang


Les passionnés d’astronomie ont observé ce dimanche comme ici au-dessus des pyramides de Gizeh, en Égypte, une Lune de sang, à l’occasion d’une éclipse lunaire totale. Ce phénomène, qui teinte de rouge le satellite de la Terre, se produit quand le soleil, la Terre et la Lune sont parfaitement alignés dans cet ordre et que la Lune est dans sa phase pleine. 

Xinhua/ABACA

07/09/2025

ASTRONOMY - 2025 September 7

 2025 September 7

An illustration of planet Earth is shown where the 
Earth is tan and has no water shown on its surface. In
the foreground are several small blue spheres showing how
much water is known to reside on our planet.
Please see the explanation for more detailed information.

All the Water on Planet Earth
Illustration Credit: Jack Cook, Adam Nieman, Woods Hole Oceanographic Institution; Data source: Igor Shiklomanov

Explanation: How much of planet Earth is made of water? Very little, actually. Although oceans of water cover about 70 percent of Earth's surface, these oceans are shallow compared to the Earth's radius. The featured illustration shows what would happen if all of the water on or near the surface of the Earth were bunched up into a ball. The radius of this ball would be only about 700 kilometers, less than half the radius of the Earth's Moon, but slightly larger than Saturn's moon Rhea which, like many moons in our outer Solar System, is mostly water ice. The next smallest ball depicts all of Earth's liquid fresh water, while the tiniest ball shows the volume of all of Earth's fresh-water lakes and rivers. How any of this water came to be on the Earth and whether any significant amount is trapped far beneath Earth's surface remain topics of research.

ASTRONOMIE - Un phénomène astronomique exceptionnel illuminera la nuit de rouge ce soir


Dans la nuit du 7 au 8 septembre, le ciel se transformera sous nos yeux lors d'un événement astronomique rare, avec un spectacle magnifique et accessible à tous, visible par une grande partie de l'humanité.

Dans quelques heures, lever les yeux suffira pour assister à un spectacle qui ne ressemble à rien de ce que l'on voit d'ordinaire. La Lune, familière et pâle compagne des nuits, prendra des allures surnaturelles. Son disque s'assombrira peu à peu, puis se colorera d'un rouge profond, comme si le ciel lui-même se teignait de braises. Ce phénomène, qui attire autant les passionnés d'astronomie que les curieux, s'annonce comme l'un des plus impressionnants de la décennie.

L'événement en question n'est autre qu'une éclipse lunaire totale, un rendez-vous rare où la Terre se glisse entre le Soleil et son satellite. Cette fois-ci, la durée frôle l'exception : 3 heures et 30 minutes pour suivre chaque étape de la métamorphose. Contrairement aux éclipses solaires, qui exigent lunettes spécialisées et prudence, celle-ci peut se contempler à l'œil nu, sans danger. Un luxe pour les observateurs qui n'auront qu'à trouver un ciel dégagé.

La portée de cette éclipse dépasse largement les frontières. Les astronomes estiment que près de 7 milliards d'humains pourront l'admirer, soit environ 60 % de la population mondiale. L'Asie, une partie de l'Afrique et l'ouest de l'Australie auront droit au spectacle complet. En Europe, en Amérique du Sud et dans d'autres régions du globe, il sera au moins partiellement visible. Autant dire qu'il s'agit d'un moment partagé à une échelle rarement atteinte.

CommentçaMarche

06/09/2025

ASTRONOMIE - L’éclipse totale de Lune du 7 septembre 2025


Au soir du 7 septembre, la Lune se lèvera totalement éclipsée en France métropolitaine et autres pays voisins. Un spectacle étrange à guetter juste au-dessus de l’horizon !

Une éclipse totale… pas totalement visible

Rappelons qu’une éclipse totale de Lune se produit lorsque notre satellite naturel passe dans l’ombre de la Terre. Elle apparaît alors fortement obscurcie et rougeâtre.

Ce phénomène d’une durée limitée (en général 1 à 2 heures) n’est entièrement visible que depuis les régions de la Terre qui sont tournées vers la Lune à ce moment-là. Ainsi, ce seront surtout l’Asie et l’océan Indien qui profiteront le mieux de l’éclipse totale du 7 septembre 2025. Dans les parties occidentales de l’Europe et de l’Afrique, la Lune ne sera pas encore levée quand elle pénétrera dans l’ombre de la Terre. Elle se lèvera totalement éclipsée, et le restera pendant quelques dizaines de minutes avant de retrouver peu à peu son éclat. Ce spectacle insolite mérite d’être suivi !

Carte de visibilité de l’éclipse totale de Lune du 7 septembre 2025. Dans les zones situées entre les courbes rouges marquées T1 et T2, la Lune est totalement éclipsée à son lever. Les courbes bleues indiquent une Lune éclipsée à son coucher. Crédit : LTE.

Que verra-t-on en France métropolitaine et dans les pays voisins ?

Vue depuis le centre de la France métropolitaine, la Lune se lèvera vers 20h20 (heure légale), au-dessus de l’horizon est/sud-est. Pour tout autre lieu, nous vous invitons à consulter l’heure précise du lever de la Lune afin de pouvoir guetter son émergence. Choisissez un endroit dégagé à l’horizon, sinon la Lune vous fera attendre un certain temps avant de se montrer !

Un lever de lune fantomatique


Au soir du 7 septembre, la Lune sera pleine (c’est une des conditions pour qu’il y ait éclipse). Un lever de pleine lune est toujours spectaculaire car le disque lunaire semble énorme quand il est près de l’horizon. De plus, l’éclat de la Lune devrait être très particulier :
  • non seulement elle sera éclairée par une lumière rouge sombre caractéristique des éclipses (quelques rayons de lumière du Soleil lui parviennent après avoir été filtrés et réfractés, c’est-à-dire déviés, par l’atmosphère terrestre) ;
  • mais aussi, nous la verrons à travers une épaisse couche d’air qui a toujours tendance à rendre rougeoyants les astres à leur lever ou à leur coucher (phénomène d’absorption, toujours cet effet de filtre).
Ajoutons à cela que le pâle disque lunaire sera noyé dans les lueurs du crépuscule, et nous aurons au final une Lune assez fantomatique !


Stelvision

NUCLEAIRE - Carte « L’industrie nucléaire en France »


Cette carte recense les principaux sites de l’industrie nucléaire en France :Réacteurs en fonctionnement et à l’arrêt

Sites de stockage ou entreposage
Site de fabrication ou de retraitement de combustible nucléaire
Structures de recherche en fonctionnement et à l’arrêt
Nombre d’anciennes mines d’uranium par département

Il n’y figure pas les sites associés exclusivement au nucléaire militaire, l’emplacement des mines d’uranium non associées à un site de stockage de résidus d’extraction, les sites associés au nucléaire à usage médical, certains centres de stockage de déchets ultimes au plan chimique qui contiennent des déchets radioactifs.

Cette carte est sous licence libre « Creative Commons ». Vous pouvez l’imprimer, la diffuser et la réutiliser librement, sous réserve de respecter les conditions suivantes : mention de la CRIIRAD, aucune modification, aucune utilisation commerciale.

Vous pouvez télécharger le fichier PDF de la carte pour la diffuser et l’imprimer par vos propres moyens :


CRIIRAD

ASTRONOMY - Sardinia Sunset

 2025 September 6

See Explanation.  Clicking on the picture will download
the highest resolution version available.

Sardinia Sunset
Image Credit & Copyright: Lorenzo Busilacchi

Explanation: When the sun sets on September 7, the Full Moon will rise. And on that date denizens around much of our fair planet, including parts of Antarctica, Australia, Asia, Europe, and Africa can witness a total lunar eclipse, with the Moon completely immersed in Earth's shadow. As the bright Full Moon first enters Earth's shadow it will darken, finally taking on a reddish hue during the total eclipse phase. In fact, the color of the Moon during a total lunar eclipse is due to reddened light from sunrises and sunsets around planet Earth. The reddened sunlight is scattered by a dense atmosphere into the planet's otherwise dark central shadow. When the sun set on August 22, this telephoto snapshot of red skies, blue sea, and the Mangiabarche Lighthouse was captured from Sant'Antioco, Sardinia, Italy.

05/09/2025

SANTé/MEDECINE - GUERISON DU CANCER - Un espoir immense - Conclusion -7/7-

La science avance

À l’heure où la lassitude gagne face aux cancers qui reviennent sans cesse, où chaque avancée semble engloutie par la réalité clinique, la découverte sud-coréenne est une claque d’air frais. Et si la prochaine décennie abolissait la nécessité de détruire pour guérir ? Oui, le scepticisme, oui la prudence, mais aussi l’extrême urgence de repenser notre arsenal. Les premiers résultats sont enthousiastes, mais la vraie révolution sera de passer du laboratoire à l’humain, d’éviter la tentation du miracle annoncé, de creuser, sans relâcher, les failles potentielles. S’il fallait parier sur une approche radicalement neuve, où la science tutoie la réparation plutôt que la destruction, ce serait celle-ci. Et si, pour une fois, il fallait accorder du crédit à une percée qui nous sort enfin du carcan chimiothérapeutique,pour se tourner vers une médecine de la réconciliation cellulaire ? Affaire à suivre, de très près.

©Adobe Stock

ASTRONOMY - 47 Tucanae: Globular Star Cluster

 2025 September 5

See Explanation.  Clicking on the picture will download
the highest resolution version available.

47 Tucanae: Globular Star Cluster
Image Credit & Copyright: Carlos Taylor

Explanation: Also known as NGC 104, 47 Tucanae is a jewel of the southern sky. Not a star but a dense cluster of stars, it roams the halo of our Milky Way Galaxy along with some 200 other globular star clusters. The second brightest globular cluster (after Omega Centauri) as seen from planet Earth, 47 Tuc lies about 13,000 light-years away. It can be spotted with the naked eye close on the sky to the Small Magellanic Cloud in the constellation of the Toucan. The dense cluster is made up of hundreds of thousands of stars in a volume only about 120 light-years across. Red giant stars on the outskirts of the cluster are easy to pick out as yellowish stars in this sharp telescopic portrait. Tightly packed globular star cluster 47 Tuc is also home to a star with the closest known orbit around a black hole.

ASTRONOMIE - Iréelle

Cette vue d’artiste de la planète Cha 1107-7626 est publiée par l’Observatoire européen austral. Cette planète vagabonde est située à enviro...