Monde sous-marin - UN ETRANGE VER ENCORNET : LE TEUTHIDODRILUS

Découvert en 2007 dans la mer de Célèbes, en Asie du Sud-Est, ce ver très étrange (Teuthidodrilus) a été nommé squidworm en anglais (« ver encornet ») par les scientifiques américains.

© Laurence Madin, WHOI

Astronomy - CASSINI APPROACHES SATURN

 

Cassini Approaches Saturn

Video Credit & Copyright: Cassini Imaging Team, ISS, JPL, NASA, ESA, S. Van Vuuren et al.;
Music: Adagio for Strings (NY Philharmonic)

Explanation: What would it look like to approach the grand planet Saturn? One doesn't have to just imagine -- the Cassini spacecraft did just this in 2004, recording thousands of images along the way, and hundreds of thousands more since entering orbit. Some of Cassini's early images have been digitally tweaked, cropped, and compiled into the featured inspiring video which is part of a larger IMAX movie project named In Saturn's Rings. In the concluding sequence, Saturn looms increasingly large on approach as cloudy Titan swoops below. With Saturn whirling around in the background, Cassini is next depicted flying over Mimas, with large Herschel Crater clearly visible. Saturn's majestic rings then take over the show as Cassini crosses Saturn's thin ring plane. Dark shadows of the ring appear on Saturn itself. Finally, the enigmatic ice-geyser moon Enceladus appears in the distance and then is approached just as the video clip ends. After more than a decade of exploration and discovery, the Cassini spacecraft ran low on fuel in 2017 was directed to enter Saturn's atmosphere, where it surely melted.

Astronomy - MOSTLY PERSEIDS

 2026 August 22

Mostly Perseids
Image Credit & Copyright: Jakub Koukal (Valašské Meziříčí Observatory)

Explanation: Recorded the night of August 12-13, images from four dedicated meteor-monitoring cameras at an astronomical observatory in Czechia were aligned and combined to create this all-night, all-sky view. On that night, the total count came to 1,706 meteors. And since that coincided with the peak activity of the 2026 Perseid Meteor Shower, most are perseids. Their overwhelming numbers make them easy to spot. Quite convincingly, perseid trails all trace back to a single radiant on the sky at the upper right, a region in the annual shower's eponymous constellation Perseus. But meteors belonging to other much less active showers can also revealed by finding their radiants too. For example, seen crossing the perseid trails are meteors from a shower whose radiant lies in Cygnus, known as Kappa Cygnids. The antihelion complex, a general region near Aquarius and opposite the Sun in the sky, is also identifiable as a weak source for meteors.

Astronomy - SIMULATION TNG50 : A GALAXY CLUSTER FORMS

Simulation TNG50: A Galaxy Cluster Forms

Video Credit: IllustrisTNG Project; Visualization: Dylan Nelson (Max Planck Institute for Astrophysics) et al.
Music: Symphony No. 5 (Ludwig van Beethoven), via YouTube Audio Library

Explanation: How do clusters of galaxies form? Since our universe moves too slowly to watch, faster-moving computer simulations are created to help find out. One famous effort is TNG50 from IllustrisTNG, an upgrade of the famous Illustris Simulation. The first part of the featured video tracks cosmic gas (mostly hydrogen) as it evolves into galaxies and galaxy clusters from the early universe to today, with brighter colors marking faster moving gas. As the universe matures, gas falls into gravitational wells, galaxies forms, galaxies spin, galaxies collide and merge, all while black holes form in galaxy centers and expel surrounding gas at high speeds. The second half of the video switches to tracking stars, showing a galaxy cluster coming together, complete with stellar streams. The outflow from black holes in TNG50 is surprisingly complex and details are being compared with our real universe. Studying how gas coalesced in the early universe helps humanity better understand how our Earth, Sun, and Solar System originally formed.

Villes bioniques du futur - L'ARCHE BIONIQUE DE TAIWAN : UNE TOUR AUTOSUFFISANTE

Outre des panneaux solaires, trois éoliennes à axes verticaux fournissent l'énergie électrique. Les vitres, par effet de serre, assurent un apport thermique aux espaces intérieurs.

© Vincent Callebaut

Astronomy - THE ELEPHANT'S TRUNK IN CEPHEUS

 2026 August 20

The Elephant's Trunk in Cepheus
Image Credit & Copyright: Eddie Sgarbossa

Explanation: Like an illustration in a galactic Just So Story, the Elephant's Trunk Nebula winds through the emission region and young star cluster complex IC 1396, in the high and far off constellation of Cepheus. Also known as vdB 142, this cosmic elephant's trunk is over 20 light-years long. The detailed telescopic view features the bright swept-back ridges and pockets of cool interstellar dust and gas that abound in the region. But the dark, tendril-shaped clouds contain the raw material for star formation and hide protostars within. Nearly 3,000 light-years distant, the relatively faint IC 1396 complex covers a large region on the sky, spanning over 5 degrees. Top to bottom this proboscidean-like rendition reaches across an almost 1 degree wide field of view, though. That's a little less than the angular size of 2 full moons.

Astronomy - RED SUN THROUGH WILDFIRE SMOKE

 2026 July 30

Red Sun through Wildfire Smoke
Image Credit & Copyright: Debra Ceravolo
Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)

Explanation: This could be the view from an exoplanet orbiting around a red dwarf star, but it is our own Sun. This image was taken on July 22, 2026, in the Okanagan region in the Canadian province of British Columbia. Wildfire smoke from the Pacific Northwest acted as a solar filter, allowing the photographer to take this photo of the Sun directly. Several sunspots are also visible in this eerie image; just below and right of the center is AR 4493, a fast evolving, giant active solar region and sunspot group. The smoke is made of tiny particles that help block and scatter light with bluer colors, so the light we see coming from the Sun is dimmer and redder than usual (but it is never safe to stare directly at the Sun). Sunsets and sunrises are also more colorful because of the smoke. Some 6 billion years from now, the Sun will actually start to turn redder as it approaches its red giant phase.

Astronomy - PERSEIDS FROM PERSUS

 2026 August 18

Perseids from Perseus
Image Credit & Copyright: Jakub Kuřák

Explanation: This was a good year for the Perseids meteor shower. A key reason was the Moon was absent from lighting up Earth's night sky so that more meteors were visible than usual. Where was the Moon? It was busy visiting the Sun. Near the Perseids peak, the Moon moved directly in front of the Sun and created a total solar eclipse visible from Greenland and Spain. The Perseids occur when the Earth collides with a stream of Sun-orbiting debris cast off by Comet Swift-Tuttle. Perseid meteors, although typically only the size of a sand grain, tend to be fast and bright because Swift-Tuttle's debris orbits the Sun in a direction partly opposite Earth's orbital motion. In the featured image compilation, accumulated over several nights from Jizerka in the Czech Republic, the Perseids meteor streaks can be traced back to a single location on the sky -- its radiant in Perseus.

Monde sous-marin - ESCARGOT DES SOURCES HYDROTHERMALES DU JAPON

Ce mollusque gastéropode des sources hydrothermales, est un escargot du genre Alviniconcha associé à des symbiotes chimiotrophes. Cet individu, retrouvé au niveau du mont sous-marin de Suiyo (Japon), est le seul de son espèce jamais découvert.

© Yoshihiro FUJIWARA / JAMSTEC

Astronomy - A GOLDEN CORONA ECLIPSE

 2026 August 17

A Golden Corona Eclipse
Image Credit & Copyright: Rui Santos (Living Impressions)

Explanation: This total solar eclipse appeared not only poetically beautiful but scientifically interesting. Usually the solar corona appears white, and to some observers the corona of last week's total solar eclipse did appear this pearly color. But this time, totality observers in Spain saw a corona that appeared unusually golden. For one reason, from Spain, the totality occurred when the setting Sun was near the horizon. That low, sunlight travels through a large amount of air which scatters out blue light. An unusual amount of smoke in the air from nearby forest fires acted as a second filter, further scattering the remaining blue tones and deepening the already gold-dominated light. The HDR-processed, multiple-exposure featured image was captured from Benavente, Spain last week. One thing that did not appear golden was a hydrogen-glowing prominence that hovered over the Sun's left edge -- its original bright pink color survived.

Villes bioniques du futur - L'ARCHE BIONIQUE DE TAIWAN : LA NATURE A LA VERTICALE

Dans le parc Gateway de Taichung, à Taiwan, cette tour est comme une forêt dans la ville. Des prairies et des jardins s'étalent en palier sur 390 m de hauteur dans un bâtiment autosuffisant, grâce aux énergies solaire et éolienne. On s'y promène pour apprécier la nature et pour trouver une vision panoramique sur la mégalopole. La tour sert aussi pour les relais de télécommunications.

© Vincent Callebaut

Astronomy - MILKY WAY OVER YELLOWSTONE

2026 August 16

Milky Way over Yellowstone
Image Credit & Copyright: Dave Lane

Explanation: The Milky Way was not created by an evaporating lake. The colorful pool of water, about 10 meters across, is known as Silex Spring and is located in Yellowstone National Park in Wyoming, USA. Illuminated artificially, the colors are caused by layers of bacteria that grow in the hot spring. Steam rises off the spring, heated by underground magma associated with the Yellowstone Hotspot. Unrelated and far in the distance, the central band of our Milky Way Galaxy arches high overhead, a band lit by billions of stars. The picture features a 16-image panorama taken in 2014. If the Yellowstone Hotspot causes another supervolcanic eruption as it did about 640,000 years ago, a large part of North America 

Astronomy - BRIGHT PERSEIDES FROM SWEDEN

 2026 August 15

Bright Perseids from Sweden
Image Credit & Copyright: P-M Hedén (Clear Skies, TWAN)

Explanation: Known for its bright and fast meteors, the annual Perseid Meteor Shower comes to planet Earth's skies from a radiant in the heroic constellation Perseus. The popular northern summer celestial spectacle is created as grains of dust cast off along the orbit of periodic comet 109P/Swift-Tuttle vaporize in Earth's dense atmosphere, tracing brief, but beautiful streaks through the night. Taken near the shower's peak of activity on August 12, this composite image recorded two bright perseid meteors and one meteor's watery reflection from a location near the coastal village of Grisslehamn, Sweden. Almost as bright as Altair, brightest star on the scene, the meteors appear along with the faint, diffuse background of the Milky Way. This year, the shower's peak activity coincided with a New Moon, so perseid meteor flashes were undiminished by bright moonlight. And for many skywatchers, this night of bright perseid meteors followed their viewing of the silhouette of the New Moon in a much anticipated solar eclipse.

Monde sous-marin - LA GALATHEE YETI OU CRABE YETI - KIWA HIRSUTA

La Galathée yéti (Kiwa hirsuta) ou crabe yéti est un crabe très particulier. Elle a été trouvée au niveau des sites hydrothermaux de la dorsale Pacifique-Antarctique, au sud de l'île de Pâques, et a donné naissance à une nouvelle famille, les Kiwidae. Son nom de genre, Kiwa, provient de la déesse polynésienne des coquillages et crustacés et son nom d'espèce, hirsuta, fait référence à son aspect velu...

© Ifremer, A. Fifis, 2006

Astronomy - TOTAL SOLAR ECLIPSE FROM GREENLAND

 2026 August 14

Total Solar Eclipse from Greenland
Image Credit & Copyright: Aditya Madhavan

Explanation: On August 12, the Moon's shadow reached out to touch our fair planet. Beginning in the Arctic Ocean, it swept along a narrow track that led the dark lunar umbra across parts of Greenland, Iceland, the Atlantic, Portugal, and northern Spain. And for a moment, denizens of Earth who found themselves with clear skies under the shadow of the Moon could witness a total solar eclipse. After dodging the weather by sea and making a landing along Rype Fjord on the Greenland east coast (at 71.07055N, 27.71252W), this hard-won snapshot was captured at 17:33:26 UTC. That's near the initial reach of clearing skies along the path of totality, so the image is likely one of the first unobstructed views of the totally eclipsed Sun. Through a break in the clouds, the stunning photo also records one of this eclipse's transient diamond rings and the magnificent solar corona emerging near the moment totality began.

Astronomy - TOTAL SOLAR ECLIPSE OVER SPAIN

 2026 August 13

Total Solar Eclipse Over Spain
Image Credit & Copyright: Ruiyu Zhang
Text: Keighley Rockcliffe (NASA GSFC, UMBC CSST, CRESST II)

Explanation: On August 12th, 2026, the Moon totally eclipsed the Sun and cast its shadow across Siberia, Greenland, Iceland, Spain, and Portugal. Today’s image features two total solar eclipses viewed from Zaragoza, Spain, one over the Cathedral-Basilica of Our Lady of the Pillar and the other reflecting in the Ebro River. For a few moments, Spain saw its first major total solar eclipse since 1905. Those witnessing totality may experience a chill in the air, the quieting of birds, the confused chirps of insects, and the shared awe of many. It’s the corona’s time to shine as the Sun’s bright disk is blocked by the Moon. Among other reasons to study eclipses, they help scientists understand why the corona is millions of degrees hotter than the Sun’s surface. Enthusiastic citizens can contribute to these studies by recording how wildlife responds, imaging the corona, and monitoring air temperature and clouds.

Monde sous-marin - CROSSOTA NORVEGICA : UNE ETRANGE MEDUSE ROUGE

Cette méduse rouge (Crossota norvegica) a été observée dans les profondeurs de l'Arctique grâce à un sous-marin téléguidé.

© Kevin Raskoff, DR

Astronomy - A FIRE RAINBOW OVER WEST VIRGINIA

 2026 August 2

A Fire Rainbow over West Virginia
Image Credit & Copyright: Christa Harbig

Explanation: What's happening to this cloud? Ice crystals in a distant cirrus cloud are acting like little floating prisms. Known informally as a fire rainbow for its flame-like appearance, a circumhorizon arc appears parallel to the horizon. For a circumhorizontal arc to be visible, the Sun must be at least 58 degrees high in a sky where cirrus clouds present below -- in this case cirrus fibratus. The numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight in a collectively similar manner. Therefore, circumhorizontal arcs are somewhat unusual to see. The featured fire rainbow was photographed in 2021 near North Fork Mountain in West Virginia, USA.

Astronomy - CONTEMPLATING THE SUN

 2026 August 9

Contemplating the Sun
Image Credit & Copyright: Steven Gilbert

Explanation: Have you contemplated your home star recently? Featured here, a Sun partially eclipsed on the top left by the Moon is also seen eclipsed by earthlings contemplating the eclipse below. This spectacular menagerie of silhouettes was taken in 2012 from the Glen Canyon National Recreation Area near Page, Arizona, USA, where park rangers and astronomers expounded on the unusual event to interested gatherers. Also, faintly visible on the Sun's disk, just to the lower right of the dark Moon's disk, is a group of sunspots. A new solar eclipse will occur this week and give many people in northern North America, Europe, and northwestern Africa a new chance to contemplate a partially eclipsed Sun. A thin swath of Earth through Greenland and Spain will further experience a total solar eclipse. An open question is whether any meteors from the peaking Perseids will be visible during totality.

Santé/Médecine - POURQUOI LES HOMMES DEVRAIENT S'ASSEOIR POUR URINER

Pour de très nombreux hommes, quoi de plus naturel que d'uriner debout... Pourtant, adopter une position assise présente certains avantages, notamment pour la santé.

Uriner est l'un des gestes les plus naturels qui soient. Beaucoup d'hommes le font sans réfléchir ni même se soucier de leur posture. Pourtant, « faire pipi » assis plutôt que debout pourrait présenter bien des avantages.

Une meilleure vidange de la vessie

Plusieurs études ont déjà comparé la position assise au fait d'être debout au moment de la miction. Résultat, la première permet de détendre les muscles du plancher pelvien et ainsi une meilleure vidange. Sans oublier qu'en position debout, certains « poussent » inconsciemment. Ce qui, à terme, peut provoquer des douleurs pelviennes, des tensions...

Ceci est particulièrement bénéfique pour les hommes souffrant d'affections telles que l'hyperplasie bénigne de la prostate (volume anormalement important), qui peut rendre le simple fait d'uriner difficile.

Une bonne santé prostatique

Car oui, la prostate grossit naturellement avec l'âge. Ce qui peut devenir un facteur de contraintes pour la vessie et les voies urinaires. En position assise, les muscles de la prostate sont plus relâchés, ce qui facilite le départ de l'urine et réduit la pression mécanique sur la glande.

Cela peut rendre la miction plus confortable et ne plus représenter un moment redoutable pour certains.

Si vous avez des problèmes d’équilibre

Pour certaines personnes, notamment les seniors ou celles ayant des problèmes d’équilibre, uriner debout peut représenter un risque de chute. S'asseoir offre une position plus stable et sécurisante, particulièrement en cas de fatigue, de vertiges ou de mobilité réduite... ou tout simplement la nuit, lorsque l'on ne veut pas allumer la lumière pour ne pas réveiller le reste de la famille.

Une question de propreté

Souvent évoqué avec humour, uriner assis limite les éclaboussures. Même si vous pensez être un excellent viseur, des projections invisibles peuvent salir les toilettes et leur environnement. La position assise permet donc de maintenir une meilleure hygiène.

Quand la position debout reste acceptable…

Mais vous l'avez compris, uriner assis est un choix personnel et n'est pas obligatoire pour tous. Par exemple, si vous ne rencontrez aucune difficulté de vidange. Et dans certains cas (aux urinoirs des lieux publics), la position debout peut même être un gain de temps.

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