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.