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05/07/2021
INSECTES - Le moustique-tigre
04/07/2021
ASTRONOMY - The Face on Mars
2021 July 4
Image Credit: NASA, Viking 1 Orbiter
Explanation: Wouldn't it be fun if clouds were castles? Wouldn't it be fun if the laundry on the bedroom chair was a superhero? Wouldn't it be fun if rock mesas on Mars were interplanetary monuments to the human face? Clouds, though, are floating droplets of water and ice. Laundry is cotton, wool, or plastic, woven into garments. Famous Martian rock mesas known by names like the Face on Mars appear quite natural when seen more clearly on better images. Is reality boring? Nobody knows why some clouds make rain. Nobody knows if life ever developed on Mars. Nobody knows why the laundry on the bedroom chair smells like root beer. Scientific exploration can not only resolve mysteries, but uncover new knowledge, greater mysteries, and yet deeper questions. As humanity explores our universe, perhaps fun -- through discovery -- is just beginning.
03/07/2021
SANTé/MéDECINE - L'alcool et le foie
Les discours anti-alcool, ça fait plusieurs années que les professionnels de la santé ne cessent d’en faire. Pourtant, le nombre de buveurs continue de grimper et ils sont de plus en plus jeunes. Si l’alcool en soi ne pose pas problème, c’est son excès qui est vivement pointé du doigt en raison de son impact sur la santé notamment le foie, et vous allez vite comprendre pourquoi.
- La fibrose qui est une accumulation de tissu cicatriciel dans le foie
- La cirrhose qui se manifeste par un dysfonctionnement total des fonctions hépatiques.
ASTRONOMY - Along the Milky Way
2021 July 3
Image Credit & Copyright: Rolf Weisenfeld
Explanation: You can't walk along the Milky Way. Still, under a dark sky you can explore it. To the eye the pale luminous trail of light arcing through the sky on a dark, moonless night does appear to be a path through the heavens. The glowing celestial band is the faint, collective light of distant stars cut by swaths of obscuring interstellar dust clouds. It lies along the plane of our home galaxy, so named because it looks like a milky way. Since Galileo's time, the Milky Way has been revealed to telescopic skygazers to be filled with congeries of innumerable stars and cosmic wonders.
02/07/2021
ASTRONOMY - AR2835: Islands in the Photosphere
2021 July 2
Image Credit & Copyright: Michael Teoh, Heng Ee Observatory, Penang, Malaysia
Explanation: Awash in a sea of incandescent plasma and anchored in strong magnetic fields, sunspots are planet-sized dark islands in the solar photosphere, the bright surface of the Sun. Found in solar active regions, sunspots look dark only because they are slightly cooler though, with temperatures of about 4,000 kelvins compared to 6,000 kelvins for the surrounding solar surface. These sunspots lie in active region AR2835. The largest active region now crossing the Sun, AR2835 is captured in this sharp telescopic close-up from July 1 in a field of view that spans about 150,000 kilometers or over ten Earth diameters. With powerful magnetic fields, solar active regions are often responsible for solar flares and coronal mass ejections, storms which affect space weather near planet Earth.
01/07/2021
ASTRONOMY - Perseverance Selfie with Ingenuity
2021 July 1
Image Credit: NASA, JPL-Caltech, MSSS
Explanation: On sol 46 (April 6, 2021) the Perseverance rover held out a robotic arm to take its first selfie on Mars. The WATSON camera at the end of the arm was designed to take close-ups of martian rocks and surface details though, and not a quick snap shot of friends and smiling faces. In the end, teamwork and weeks of planning on Mars time was required to program a complex series of exposures and camera motions to include Perseverance and its surroundings. The resulting 62 frames were composed into a detailed mosiac, one of the most complicated Mars rover selfies ever taken. In this version of the selfie, the rover's Mastcam-Z and SuperCam instruments are looking toward WATSON and the end of the rover's outstretched arm. About 4 meters (13 feet) from Perseverance is a robotic companion, the Mars Ingenuity helicopter.
PRATIQUE - Enfin une Astuce Pour Que la Grille du Barbecue ne colle plus
Vous en avez assez que de la nourriture reste collée sur la grille du barbecue ? Que ça soit du poisson, comme les sardines, ou de la viande, ça s'accroche toujours sur la grille. Résultat, il faut frotter bien fort pour nettoyer la grille, sinon elle s'encrasse rapidement. Heureusement, il existe un truc incroyable pour que les aliments ne restent plus accrochés sur le bbq. L'astuce est de frotter un oignon sur la grille avant de faire cuire les aliments.
28/06/2021
ASTRONOMY - A Paper Moon Solar Eclipse
2021 June 28
Image Credit & Copyright: Wang Letian (Eyes at Night)
Explanation: It may look like a paper Moon. Sailing past a canvas Sun. But those are not cardboard clouds. And it's not make believe. The featured picture of an orange colored sky is real -- a digital composite of two exposures of the solar eclipse that occurred earlier this month. The first exposure was taken with a regular telescope that captured an overexposed Sun and an underexposed Moon, while the second image was taken with a solar telescope that captured details of the chromosphere of the background Sun. The Sun's canvas-like texture was brought up by imaging in a very specific shade of red emitted by hydrogen. Several prominences can be seen around the Sun's edge. The image was captured just before sunset from Xilingol, Inner Mongolia, China. It's also not make-believe to imagine that the Moon is made of dense rock, the Sun is made of hot gas, and clouds are made of floating droplets of water and ice.
26/06/2021
ASTRONOMY - Pixels in the Sun
2021 June 26
Image Credit & Copyright: Wang Letian (Eyes at Night)
Explanation: These two panels, composed of video frames made with a safe solar telescope and hydrogen alpha filter, show remarkably sharp details on the solar disk and giant prominences along the Sun's edge on June 6 (top) and June 18. Taken from Beijing, China, they also show a transit of the International Space Station and China's new Tiangong Space Station in silhouette against the bright Sun. The International Space Station is near center in the bottom panel, crossing the solar disk left of bright active region AR2833 and below a large looping solar filament. The Chinese space station is below solar active region AR2827 and right of center in the top panel, seen as a smaller, combined "+" and "-" shape. The pictures of the transiting orbital outposts were taken with the same equipment and at the same pixel scale, with the International Space Station some 492 kilometers away. The Chinese space station was over 400 kilometers from the camera.
24/06/2021
ASTRONOMY - Messier 99
2021 June 24
Image Credit: NASA, ESA, Hubble, Janice Lee; Processing & Copyright: Leo Shatz
Explanation: Grand design spiral galaxy Messier 99 looks majestic on a truly cosmic scale. This recently processed full galaxy portrait stretches over 70,000 light-years across M99. The sharp view is a combination of ultraviolet, visible, and infrared image data from the Hubble Space Telescope. About 50 million light-years distant toward the well-groomed constellation Coma Bernices, the face-on spiral is a member of the nearby Virgo Galaxy Cluster. Also cataloged as NGC 4254, a close encounter with another Virgo cluster member has likely influenced the shape of its well-defined, blue spiral arms.
LA TERRE VUE DU CIEL - New York vue de l'ISS
La ville de New York photographiée en 2010 depuis la Station spatiale internationale au cours de l'Expédition 24. © Fyodor Yurchikhin/R...
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2022 September 26 All the Water on Planet Earth Illustration Credit: Jack Cook, Adam Nieman, Woods Hole Oceanographic Institution ; Data ...
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2025 February 17 SpaceX Rocket Launch Plume over California Image Credit & Copyright: Martin LaMontagne Explanation: What's happe...