Nombre total de pages vues
22/03/2024
SANTé/MEDECINE - PLANTES MEDICINALES ET LEURS VERTUS - L’ail
SANTé/MEDECINE - Avancées majeures et espoir pour le cancer du sein
INVENTEURS TUéS PAR LEURS CREATIONS - Cowper Coles
ASTRONOMY - Phobos: Moon over Mars
2024 March 22
Image Credit: NASA, ESA, Zolt Levay (STScI) - Acknowledgment: J.Bell (ASU) and M.Wolff (SSI)
Explanation: A tiny moon with a scary name, Phobos emerges from behind the Red Planet in this timelapse sequence from the Earth-orbiting Hubble Space Telescope. Over 22 minutes the 13 separate exposures were captured near the 2016 closest approach of Mars to planet Earth. Martians have to look to the west to watch Phobos rise, though. The small moon is closer to its parent planet than any other moon in the Solar System, about 3,700 miles (6,000 kilometers) above the Martian surface. It completes one orbit in just 7 hours and 39 minutes. That's faster than a Mars rotation, which corresponds to about 24 hours and 40 minutes. So on Mars, Phobos can be seen to rise above the western horizon 3 times a day. Still, Phobos is doomed.
21/03/2024
SANTé/MEDECINE - Le fonctionnement de l'oeil humain - Muscle oblique et trochlée de l'œil
SANTé/MEDECINE - HISTOIRE - 1846 : William Morton et les débuts de l'anesthésie
INVENTEURS TUéS PAR LEURS CREATIONS - William Bullock
ASTRONOMY -The Leo Trio
2024 March 21
Image Credit & Copyright: Steve Cannistra
Explanation: This popular group leaps into the early evening sky around the March equinox and the northern hemisphere spring. Famous as the Leo Triplet, the three magnificent galaxies found in the prominent constellation Leo gather here in one astronomical field of view. Crowd pleasers when imaged with even modest telescopes, they can be introduced individually as NGC 3628 (left), M66 (bottom right), and M65 (top). All three are large spiral galaxies but tend to look dissimilar, because their galactic disks are tilted at different angles to our line of sight. NGC 3628, also known as the Hamburger Galaxy, is temptingly seen edge-on, with obscuring dust lanes cutting across its puffy galactic plane. The disks of M66 and M65 are both inclined enough to show off their spiral structure. Gravitational interactions between galaxies in the group have left telltale signs, including the tidal tails and warped, inflated disk of NGC 3628 and the drawn out spiral arms of M66. This gorgeous view of the region spans over 1 degree (two full moons) on the sky in a frame that covers over half a million light-years at the trio's estimated distance of 30 million light-years.
20/03/2024
SANTé/MEDECINE - Le fonctionnement de l'oeil humain - La consultation chez l'ophtalmologiste
SANTé/MEDECINE - La tomographie : La caméra TEP : voir le cerveau grâce à des traceurs radioactifs
LES PLUS BEAUX ASTRES DE LA VOIE LACTéE - Pluton : la planète naine
Cette vue d'artiste représente la surface de Pluton , imaginée d'après les études scientifiques. Elle montre des amas de méthane sur...
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2021 May 11 Lightning and Orion Beyond Uluru Image Credit & Copyright: Park Liu Explanation: What's happening behind Uluru? A Un...
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Extraordinary Solar Halos Image Credit & Copyright : Magnus Edback Explanation: Welcome to the December Solstice, the first...