ASTRONOMY - Lyrid of the Lake

 2022 April 28

Lyrid of the Lake
Image Credit & Copyright: Jeff Dai (TWAN)

Explanation: In the early hours of April 24 this bright Lyrid meteor flashed along the central Milky Way. For a moment, it cast a bright reflection across Lake Nian, Yunnan province, China. The annual Lyrid meteor shower, one of the oldest known, is active in late April, as our fair planet plows through dust left along the orbit of long-period comet Thatcher. The trail of the bright fireball points back toward the shower's radiant in the constellation Lyra high in the northern springtime sky and off the top of the frame. Just rising in that starry sky, light from a third quarter moon also cast a glow on the peaceful waters of the lake.

ASTRONOMY - Moon Shadow on Jupiter

 2022 April 27

Moon Shadow on Jupiter
Image Credit: NASA/JPL-Caltech/SwRI/MSSS; Processing & License: Thomas Thomopoulos

Explanation: What is that large dark spot on Jupiter? It's the shadow of Ganymede, Jupiter's largest moon. When Jupiter's moons cross between the Jovian giant and the Sun, they created shadows just like when the Earth's moon crosses between the Earth and the Sun. Also like on Earth, if you were in a dark shadow on Jupiter, you would see a moon completely eclipse the Sun. Unlike on Earth, moon shadows occur most days on Jupiter -- what's more unusual is that a spacecraft was close enough to record one with a high-resolution image. That spacecraft, Juno, was passing so close to Jupiter in late February that nearby clouds and the dark eclipse shadow appear relatively large. Juno has made many discoveries about our Solar System's largest planet, including, recently, rapidly expanding circular auroras.

ASTROPHOTOGRAPHIE - Grains de Bailly lors d'une éclipse totale de Soleil

 

L'éclipse totale de Soleil du 9 mars 2016 photographiée à Luwuk, en Indonésie. Cette image composite de Yu Jun a remporté le premier prix du concours en 2016 dans la catégorie « Soleil ». L'auteur raconte qu'il a surtout voulu montrer la formation des « grains de Bailly » ; ces perles de lumière qui apparaissent sur le limbe de la Lune sont créées par les rayons du Soleil se faufilant entre les reliefs de notre satellite.

© Yu Jun, IAPY 2016

MERVEILLEUX MONDE SOUS-MARIN - L'atoll de Fakarava, dans l'archipel des Tuamotu

 

Atoll de Fakarava, dans l'archipel des Tuamotu, Polynésie française - Réserve de la biosphère. Vue mi-air mi-eau sur un univers paradisiaque.

© Photographe Alexis Rosenfeld

ASTRONOMY - The Great Nebula in Carina

2022 April 25

The Great Nebula in Carina
Image Credit & Copyright: Ignacio Javier Diaz Bobillo

Explanation: In one of the brightest parts of Milky Way lies a nebula where some of the oddest things occur. NGC 3372, known as the Great Nebula in Carina, is home to massive stars and changing nebulas. The Keyhole Nebula (NGC 3324), the bright structure just below the image center, houses several of these massive stars. The entire Carina Nebula, captured here, spans over 300 light years and lies about 7,500 light-years away in the constellation of Carina. Eta Carinae, the most energetic star in the nebula, was one of the brightest stars in the sky in the 1830s, but then faded dramatically. While Eta Carinae itself maybe on the verge of a supernova explosion, X-ray images indicate that much of the Great Nebula in Carina has been a veritable supernova factory. 

ASTRONOMY - Split the Universe

2022 April 24

Split the Universe
Image Credit: NASA, Erwin Schrödinger's cat

Explanation: Just now, before you hit the button, two future universes are possible. After pressing the button, though, you will live in only one. A real-web version of the famous Schrödinger's cat experiment clicking the red button in the featured astronaut image should transform that image into a picture of the same astronaut holding one of two cats -- one living, or one dead. The timing of your click, combined with the wiring of your brain and the millisecond timing of your device, will all conspire together to create a result dominated, potentially, by the randomness of quantum mechanics. Some believe that your personally-initiated quantum decision will split the universe in two, and that both the live-cat and dead-cat universes exist in separate parts of a larger multiverse. Others believe that the result of your click will collapse the two possible universes into one -- in a way that could not have been predicted beforehand. Yet others believe that the universe is classically deterministic, so that by pressing the button you did not really split the universe, but just carried out an action predestined since time began. We at APOD believe that however silly you may feel clicking the red button, and regardless of the outcome, you should have a thought-provoking day. Or two.

SANTE/MEDECINE - Quel est l'alcool qui a le plus d'effet sur notre tour de taille ?

On le sait, l'alcool et ses sucres cachés n'est vraiment pas bon pour la ligne et réduire sa consommation d'alcool est l'une des premières choses à faire quand on se lance dans un régime.

Mais des chercheurs de l'université de l'Iowa (Etats-Unis) ont cherché à savoir si toutes les variétés d'alcool avaient le même effet sur notre taille. Et la réponse à cette question, qu'ils ont vérifiée auprès de 1869 personnes âgées de 40 à 69 ans, est : non !

IL VAUT MIEUX BOIRE DU VIN ROUGE QUE DE LA BIÈRE

"Chaque type d'alcool contient des profils nutritionnels et des pourcentages d'alcool par volume uniques. Par conséquent, une forte préférence pour un type d'alcool a une influence sur la composition corporelle lorsqu'on en boit régulièrement" soulignent les chercheurs dans leur étude publiée sur la Wiley online library.

Les chercheurs ont découvert que la consommation régulière de bière ou de spiritueux est corrélée à un rapport taille-hanches plus élevé (ce qu'on appelle la graisse viscérale). Un effet qui n'existe pas avec le le vin rouge, en raison de sa teneur en polyphénols plus élevée. Enfin, la consommation de vin blanc a un effet plus étonnant, puisqu'il semble que ceux qui en consomment aient une plus forte densité osseuse.

TopSanté

MERVEILLEUX MONDE SOUS-MARIN - Dauphin à long bec dans la mer Rouge

Dauphin à long bec (Stenella longirostris) à Shaab Samaday. Ces dauphins peuvent mesurer deux mètres vingt et peser 75 kilos, ils sont caractérisés par leur long rostre et leur corps fin. Ils se nourrissent de petits poissons et de calmars. On les trouve dans toutes les mers tropicales et subtropicales, en troupeaux de 25 à plusieurs centaines d'individus. Très sociables et joueurs, les dauphins de Shaab Samaday laissent les baigneurs les approcher, et parfois les toucher.

Lieu : mer Rouge, région de Marsa Alam.

© Alexis Rosenfeld

FuturaSciences

MUSIC - Robert Schumann - Träumerei

"Träumerei"

ASTRONOMY - Messier 104

 2022 April 23

Messier 104
Image Credit: NASA, ESA, Hubble Legacy Archive;
Processing & Copyright: Ignacio Diaz Bobillo

Explanation: A gorgeous spiral galaxy, Messier 104 is famous for its nearly edge-on profile featuring a broad ring of obscuring dust lanes. Seen in silhouette against an extensive central bulge of stars, the swath of cosmic dust lends a broad brimmed hat-like appearance to the galaxy suggesting a more popular moniker, the Sombrero Galaxy. This sharp view of the well-known galaxy was made from over 10 hours of Hubble Space Telescope image data, processed to bring out faint details often lost in the overwhelming glare of M104's bright central bulge. Also known as NGC 4594, the Sombrero galaxy can be seen across the spectrum, and is host to a central supermassive black hole. About 50,000 light-years across and 28 million light-years away, M104 is one of the largest galaxies at the southern edge of the Virgo Galaxy Cluster. Still, the spiky foreground stars in this field of view lie well within our own Milky Way.

ASTRONOMY - Around the World at Night

 2022 April 22

Around the World at Night
Video Credit & Copyright: Jeff Dai (TWAN, IDA), Music: Peter Jeremias

Explanation: Watch this video. In only a minute or so you can explore the night skies around planet Earth through a compilation of stunning timelapse sequences. The presentation will take you to sites in the United States, Germany, Russia, Iran, Nepal, Thailand, Laos and China. You might even catch the view from a small island in the southeastern Pacific Ocean. But remember that while you're home tonight, the night sky will come to you. Look up and celebrate the night during this International Dark Sky Week.

ASTRONOMY - Apollo 16 Moon Panorama

 2022 April 21

Apollo 16 Moon Panorama
Image Credit: Apollo 16, NASA; Panorama Assembly: Mike Constantine

Explanation: Fifty years ago, April 20, 1972, Apollo 16's lunar module Orion touched down on the Moon's near side in the south-central Descartes Highlands. While astronaut Ken Mattingly orbited overhead in Casper the friendly command and service module the Orion brought John Young and Charles Duke to the lunar surface. The pair would spend nearly three days on the Moon. Constructed from images (AS16-117-18814 to AS16-117-18820) taken near the end of their third and final surface excursion this panoramic view puts the lunar module in the distance toward the left. Their electric lunar roving vehicle in the foreground, Duke is operating the camera while Young aims the high gain communications antenna skyward, toward planet Earth.

ASTRONOMY - Stars and Globules in the Running Chicken Nebula

 2022 April 19

Stars and Globules in the Running Chicken Nebula
Image Credit & Copyright: Stefan Steve Bemmerl

Explanation: The eggs from this gigantic chicken may form into stars. The featured emission nebula, shown in scientifically assigned colors, is cataloged as IC 2944 but known as the Running Chicken Nebula for the shape of its greater appearance. Seen toward the bottom of the image are small, dark molecular clouds rich in obscuring cosmic dust. Called Thackeray's Globules for their discoverer, these "eggs" are potential sites for the gravitational condensation of new stars, although their fates are uncertain as they are also being rapidly eroded away by the intense radiation from nearby young stars. Together with patchy glowing gas and complex regions of reflecting dust, these massive and energetic stars form the open cluster Collinder 249. This gorgeous skyscape spans about 60 light-years at the nebula's estimated 6,500 light-year distance.

ASTRONOMY - Stars and Planets over Portugal

 2022 April 18

Stars and Planets over Portugal
Image Credit & Copyright: Miguel Claro (TWAN, Dark Sky Alqueva)

Explanation: The mission was to document night-flying birds -- but it ended up also documenting a beautiful sky. The featured wide-angle mosaic was taken over the steppe golden fields in Mértola, Portugal in 2020. From such a dark location, an immediately-evident breathtaking glow arched over the night sky: the central band of our Milky Way galaxy. But this sky had much more. Thin clouds crossed the sky like golden ribbons. The planet Mars appeared on the far left, while the planets Saturn and Jupiter were also simultaneously visible -- but on the opposite side of the sky, here seen on the far right. Near the top of the image the bright star Vega can be found, while the far-distant and faint Andromeda Galaxy can be seen toward the left, just below Milky Way's arch. As the current month progresses, several planets are lining up in the pre-dawn sky: Jupiter, Venus, Mars, and Saturn.

ASTRONOMIE - Quand et comment le Soleil va-t-il mourir ?

 La fin du soleil

Futura

ASTRONOMY - Shuttle Over Earth

 2022 April 17

Shuttle Over Earth
Image Credit: NASA, Expedition 22 Crew

Explanation: What's that approaching? Astronauts on board the International Space Station in 2010 first saw it far in the distance. Soon it enlarged to become a dark silhouette. As it came even closer, the silhouette appeared to be a spaceship. Finally, the object revealed itself to be the Space Shuttle Endeavour, and it soon docked as expected with the Earth-orbiting space station. Pictured here, Endeavour was imaged near Earth's horizon as it approached, where several layers of the Earth's atmosphere were visible. Directly behind the shuttle is the mesosphere, which appears blue. The atmospheric layer that appears white is the stratosphere, while the orange layer is Earth's Troposphere. Together, these thin layers of air -- collectively spanning less than 2 percent of Earth's radius -- sustain us all in many ways, including providing oxygen to breath and a barrier to dangerous radiations from space.

CENSURE - Facebook ou le pouvoir de l'arbitraire !

 

Pour des motifs de lui seul connus, Facebook a bloqué - depuis des années - les blogs ci-dessous : 

https://joanmira-6-oldies.blogspot.com/   

-   Blog 6 - Yesterday

https://joaanmira.blogspot.com/   

-   Blog 7 - Kingston

https://joanabmira.blogspot.com/

-   Blog 8 - Omnia Et Caetera - Hors normes

Nous n'avons en rien enfreint les règles de la maison ; les blogs en question traitent, respectivement de : 

- images et musiques du passé

- musique reggae, ragga et rap

- faits extraordinaires et hors normes

Nous avons, bien évidemment, réitéré des demandes d'explication à Facebook, sans réponse à ce jour...

C'est pourquoi nous lançons un appel à nos lecteurs pour qu'ils nous aident dans notre quête de respect de la liberté d'expression.

Merci,

Thank you

Obrigado

Gracias.

16-04-2022

JoanMira 

ASTRONOMY - Orion Pines

2022 April 16

Orion Pines
Image Credit & Copyright: Juan Carlos Casado (Starry Earth, TWAN)

Explanation: Taken with a camera fixed to a tripod, many short exposures were aligned with the stars to unveil this beautiful, dark night sky. Captured near the rural village of Albany`a at the northeastern corner of Spain, the three stars of Orion's belt stretch across top center in the starry frame. Alnitak, the easternmost (left) of the belt stars is seen next to the more diffuse glow of the Flame Nebula and the dark notch of the famous Horsehead. Easily visible to the naked-eye The Great Nebula of Orion is below the belt stars. A mere 1,500 light-years distant, it is the closest large stellar nursery to our fair planet. Best seen in photographs, the broad and faint arc of Barnard's Loop seems to embrace Orion's brighter stars and nebulae though. In the northern spring the familiar northern winter constellation is setting. Near the western horizon toward lower right Orion's apparently bright blue supergiant Rigel just touches the branches of a pine tree.

ASTRONOMY - The Gator-back Rocks of Mars

2022 April 15

The Gator-back Rocks of Mars
Image Credit: NASA, JPL-Caltech, MSSS

Explanation: Wind-sharpened rocks known as ventifacts, cover this broad sloping plain in the foot hills of Mount Sharp, Gale crater, Mars. Dubbed gator-back rocks their rugged, scaly appearance is captured in these digitally stitched Mastcam frames from the Curiosity rover on mission sol 3,415 (March 15, 2022). Driving over gator-back rocks before has resulted in damage to the rover's wheels, so Curiosity team members decided to turn around and take another path to continue the rover's climb. Curiosity has been on an ascent of Gale crater's central 5.5 kilometer high mountain since 2014. As it climbs, it's been able to study layers shaped by water on Mars billions of years ago.

ASTRONOMY - Messier 96

2022 April 14

Messier 96
Image Credit & Copyright: Mark Hanson and Mike Selby

Explanation: Spiral arms seem to swirl around the core of Messier 96 in this colorful, detailed portrait of a beautiful island universe. Of course M96 is a spiral galaxy, and counting the faint arms extending beyond the brighter central region it spans 100 thousand light-years or so. That's about the size of our own Milky Way. M96 is known to be 38 million light-years distant, a dominant member of the Leo I galaxy group. Background galaxies and smaller Leo I group members can be found by examining the picture. The most intriguing one is itself a spiral galaxy seen nearly edge on behind the outer spiral arm near the 1 o'clock position from center. Its bright central bulge cut by its own dark dust clouds, the edge-on background spiral appears to be about 1/5 the size of M96. If that background galaxy is similar in actual size to M96, then it would be about 5 times farther away.

ASTRONOMY - Milky Way over Devils Tower

2022 April 13

Milky Way over Devils Tower
Image Credit & Copyright: MaryBeth Kiczenski

Explanation: What created Devils Tower? The origin of this extraordinary rock monolith in Wyoming, USA is still debated, with a leading hypothesis holding that it is a hardened lava plume that never reached the surface to become a volcano. In this theory, the lighter rock that once surrounded the dense volcanic neck has now eroded away, leaving the dramatic tower. Known by Native Americans by names including Bear's Lodge and Great Gray Horn, the dense rock includes the longest hexagonal columns known, some over 180-meters tall. High above, the central band of the Milky Way galaxy arches across the sky. Many notable sky objects are visible, including dark strands of the Pipe Nebula and the reddish Lagoon Nebula to the tower's right. Green grass and trees line the foreground, while clouds appear near the horizon to the tower's left. Unlike many other international landmarks, mountaineers are permitted to climb Devils Tower.

ASTRONOMY - N11: Star Clouds of the LMC

2022 April 12

N11: Star Clouds of the LMC
Image Credit: NASA, ESA; Processing: Josh Lake

Explanation: Massive stars, abrasive winds, mountains of dust, and energetic light sculpt one of the largest and most picturesque regions of star formation in the Local Group of Galaxies. Known as N11, the region is visible on the upper right of many images of its home galaxy, the Milky Way neighbor known as the Large Magellanic Cloud (LMC). The featured image was taken for scientific purposes by the Hubble Space Telescope and reprocessed for artistry. Although the section imaged above is known as NGC 1763, the entire N11 emission nebula is second in LMC size only to the Tarantula Nebula. Compact globules of dark dust housing emerging young stars are also visible around the image. A recent study of variable stars in the LMC with Hubble has helped to recalibrate the distance scale of the observable universe, but resulted in a slightly different scale than found using the pervasive cosmic microwave background.

ASTRONOMY - Shadows at the Moon's South Pole

2022 April 10

Shadows at the Moon's South Pole
Image Credit: NASA, Arizona State U., Lunar Reconnaissance Orbiter

Explanation: Was this image of the Moon's surface taken with a microscope? No -- it's a multi-temporal illumination map made with a wide-angle camera. To create it, the Lunar Reconnaissance Orbiter spacecraft collected 1,700 images over a period of 6 lunar days (6 Earth months), repeatedly covering an area centered on the Moon's south pole from different angles. The resulting images were stacked to produce the featured map -- representing the percentage of time each spot on the surface was illuminated by the Sun. Remaining convincingly in shadow, the floor of the 19-kilometer diameter Shackleton crater is seen near the map's center. The lunar south pole itself is at about 9 o'clock on the crater's rim. Crater floors near the lunar south and north poles can remain in permanent shadow, while mountain tops can remain in nearly continuous sunlight. Useful for future outposts, the shadowed crater floors could offer reservoirs of water-ice, while the sunlit mountain tops offer good locations to collect solar power.

ASTRONOMY - Hale-Bopp: The Great Comet of 1997

2022 April 8

Hale-Bopp: The Great Comet of 1997
Image Credit & Copyright: Stefan Seip (TWAN)

Explanation: Only twenty-five years ago, Comet Hale-Bopp rounded the Sun and offered a dazzling spectacle in planet Earth's night skies. Digitized from the original astrophoto on 35mm color slide film, this classic image of the Great Comet of 1997 was recorded a few days after its perihelion passage on April 1, 1997. Made with a camera and telephoto lens piggy-backed on a small telescope, the 10 minute long, hand-guided exposure features the memorable tails of Hale-Bopp, a whitish dust tail and blue ion tail. Here, the ion tail extends well over ten degrees across the northern sky. In all, Hale-Bopp was reported as visible to the naked eye from late May 1996 through September 1997. Also known as C/1995 O1, Hale-Bopp is recognized as one of the most compositionally pristine comets to pass through the inner Solar System. A visitor from the distant Oort cloud, the comet's next perihelion passage should be around the year 4380 AD. Do you remember Hale-Bopp?

ASTRONOMY - Messier 24: Sagittarius Star Cloud

2022 April 7

Messier 24: Sagittarius Star Cloud
Image Credit & Copyright: Gabriel Rodrigues Santos

Explanation: Unlike most entries in Charles Messier's famous catalog of deep sky objects, M24 is not a bright galaxy, star cluster, or nebula. It's a gap in nearby, obscuring interstellar dust clouds that allows a view of the distant stars in the Sagittarius spiral arm of our Milky Way galaxy. When you gaze at the star cloud with binoculars or small telescope you are looking through a window over 300 light-years wide at stars some 10,000 light-years or more from Earth. Sometimes called the Small Sagittarius Star Cloud, M24's luminous stars fill this gorgeous starscape. Covering over 3 degrees or the width of 6 full moons in the constellation Sagittarius, the telescopic field of view includes dark markings B92 and B93 just above center, along with other clouds of dust and glowing nebulae toward the center of the Milky Way.

ART FRACTAL - Benoit Mandelbrot

L’objet de fractale le plus connu porte le nom de Benoît Mandelbrot, inventeur du terme, en 1974.

Fractale de Mandelbrot

Ce brave monsieur avait poussé un cri de désespoir face à ses consorts qui étudiaient alors le monde grâce à la théorie des grands nombres, laissant de côté un bon nombre de phénomènes (comme la forme des nuages, des fleuves…). N’empêche qu’après sa gueulante, on s’est un peu plus intéressé aux objets bizarres s’empoussiérant jusqu’alors dans les tiroirs des mathématiciens.

Lartboratoire

ASTRONOMY - NGC 1672: Barred Spiral Galaxy from Hubble

2022 April 6

NGC 1672: Barred Spiral Galaxy from Hubble
Image Credit: Hubble Legacy Archive, NASA, ESA; Processing & Copyright: Daniel Nobre

Explanation: Many spiral galaxies have bars across their centers. Even our own Milky Way Galaxy is thought to have a modest central bar. Prominently barred spiral galaxy NGC 1672, featured here, was captured in spectacular detail in an image taken by the orbiting Hubble Space Telescope. Visible are dark filamentary dust lanes, young clusters of bright blue stars, red emission nebulas of glowing hydrogen gas, a long bright bar of stars across the center, and a bright active nucleus that likely houses a supermassive black hole. Light takes about 60 million years to reach us from NGC 1672, which spans about 75,000 light years across. NGC 1672, which appears toward the constellation of the Dolphinfish (Dorado), has been studied to find out how a spiral bar contributes to star formation in a galaxy's central regions.

ASTRONOMY - Seven Sisters versus California

2022 April 5

Seven Sisters versus California
Image Credit & Copyright: Neven Krcmarek

Explanation: On the upper right, dressed in blue, is the Pleiades. Also known as the Seven Sisters and M45, the Pleiades is one of the brightest and most easily visible open clusters on the sky. The Pleiades contains over 3,000 stars, is about 400 light years away, and only 13 light years across. Surrounding the stars is a spectacular blue reflection nebula made of fine dust. A common legend is that one of the brighter stars faded since the cluster was named. On the lower left, shining in red, is the California Nebula. Named for its shape, the California Nebula is much dimmer and hence harder to see than the Pleiades. Also known as NGC 1499, this mass of red glowing hydrogen gas is about 1,500 light years away. Although about 25 full moons could fit between them, the featured wide angle, deep field image composite has captured them both. A careful inspection of the deep image will also reveal the star forming region IC 348 and the molecular cloud LBN 777 (the Baby Eagle Nebula).

ASTRONOMY - A Vortex Aurora over Iceland

2022 April 4

A Vortex Aurora over Iceland
Image Credit & Copyright: Christophe Suarez

Explanation: No, the car was not in danger of being vacuumed into space by the big sky vortex. For one reason, the vortex was really an aurora, and since auroras are created by particles striking the Earth from space, they do not create a vacuum. This rapidly developing auroral display was caused by a Coronal Mass Ejection from the Sun that passed by the Earth closely enough to cause a ripple in Earth's magnetosphere. The upper red parts of the aurora occur over 250 kilometers high with its red glow created by atmospheric atomic oxygen directly energized by incoming particles. The lower green parts of the aurora occur over 100 kilometers high with its green glow created by atmospheric atomic oxygen energized indirectly by collisions with first-energized molecular nitrogen. Below 100 kilometers, there is little atomic oxygen, which is why auroras end abruptly. The concentric cylinders depict a dramatic auroral corona as seen from the side. The featured image was created from a single 3-second exposure taken in mid-March over Lake Myvatn in Iceland.

ASTRONOMY - CMB Dipole: Speeding Through the Universe

2022 April 3

CMB Dipole: Speeding Through the Universe
Image Credit: DMR, COBE, NASA, Four-Year Sky Map

Explanation: Our Earth is not at rest. The Earth moves around the Sun. The Sun orbits the center of the Milky Way Galaxy. The Milky Way Galaxy orbits in the Local Group of Galaxies. The Local Group falls toward the Virgo Cluster of Galaxies. But these speeds are less than the speed that all of these objects together move relative to the cosmic microwave background radiation (CMBR). In the featured all-sky map from the COBE satellite in 1993, microwave light in the Earth's direction of motion appears blueshifted and hence hotter, while microwave light on the opposite side of the sky is redshifted and colder. The map indicates that the Local Group moves at about 600 kilometers per second relative to this primordial radiation. This high speed was initially unexpected and its magnitude is still unexplained. Why are we moving so fast? What is out there?

ASTRONOMY - Nova Scotia Northern Lights

 2022 April 2

Nova Scotia Northern Lights
Image Credit & Copyright: Jason Dain

Explanation: This almost otherworldly display of northern lights was captured in clear skies during the early hours of March 31 from 44 degrees north latitude, planet Earth. In a five second exposure the scene looks north from Martinique Beach Provincial Park in Nova Scotia, Canada. Stars of the W-shaped constellation Cassiopeia shine well above the horizon, through the red tint of the higher altitude auroral glow. Auroral activity was anticipated by skywatchers alerted to the possibility of stormy space weather by Sun-staring spacecraft. The predicted geomagnetic storm was sparked as a coronal mass ejection, launched from prolific solar active region 2975, impacted our fair planet's magnetosphere.

PHOTOGRAPHIE - Vénus et la voie lactée

 

Le retour de la voie lactée en 2022. Photos prises à la plage de la Verne à La Seyne sur Mer, devant les pointus.

Technique : Matériel : NIKON Z6 II + Nikkor 24-70 f/4. Empilement de 50 poses : 24 mm - 15 s - f/4 - ISO 800. Traitement : Sequator + Lightroom | Date : 03.02.2022

Auteur : F. Xavier Cuvelier
https://www.photorama.fr

ASTRONOMIE - Rencontre spectaculaire entre Mars et Saturne

 

Les positions respectives des planètes Mars et Saturne entre le 3 et le 7 avril 2022 vers 6h30 (heure de Paris) dans une paire de jumelles de type 10×50, avec un champ de 6 degrés.

Du côté de Mars et de Saturne, un croisement très serré se dessine : au meilleur de l’événement, les deux planètes auront une distance apparente inférieure à 20 minutes d’arc (l’équivalent des deux-tiers du diamètre lunaire) !

La rencontre est spectaculaire et aisément visible à l’œil nu bien que les deux planètes ne soient pas au maximum de leur éclat. Privilégiez simplement de les observer dans un ciel encore suffisamment noir pour les repérer : aux latitudes de la France métropolitaine, il faut donc sortir vers 6h30-6h45. Tournez-vous vers l’horizon est sud-est et repérez l’étincelante Vénus : notre duo se trouve un peu plus à droite, il s’agit de deux points à l’éclat similaire.

Stelvision