Nombre total de pages vues
23/07/2025
SANTé/MEDECINE - Cancer du foie : (6/6) Le groupe sanguin AB
22/07/2025
SANTé/MEDECINE - Cancer du foie : (5/6) Le groupe sanguin le plus susceptible de développer un cancer du foie
ASTRONOMY - A Double Detonation Supernova
Image Credit: ESO, P. Das et al.; Background stars (NASA/Hubble): K. Noll et al.
Explanation: Can some supernovas explode twice? Yes, when the first explosion acts like a detonator for the second. This is a leading hypothesis for the cause of supernova remnant (SNR) 0509-67.5. In this two-star system, gravity causes the larger and fluffier star to give up mass to a smaller and denser white dwarf companion. Eventually the white dwarf's near-surface temperature goes so high that it explodes, creating a shock wave that goes both out and in -- and so triggers a full Type Ia supernova near the center. Recent images of the SNR 0509-67.5 system, like the featured image from the Very Large Telescope in Chile, show two shells with radii and compositions consistent with the double detonation hypothesis. This system, SNR 0509-67.5 is also famous for two standing mysteries: why its bright supernova wasn't noted 400 years ago, and why no visible companion star remains.
21/07/2025
SANTé/MEDECINE - Cancer du foie : Une corrélation entre cancer du foie et groupe sanguin (4/6)
ASTRONOMY - Cat's Paw Nebula from Webb Space Telescope
2025 July 21
Image Credit: NASA, ESA, CSA, STScI
Explanation: Nebulas are perhaps as famous for being identified with familiar shapes as perhaps cats are for getting into trouble. Still, no known cat could have created the vast Cat's Paw Nebula visible toward the constellation of the Scorpion (Scorpius). At 5,700 light years distant, Cat's Paw is an emission nebula within a larger molecular cloud. Alternatively known as the Bear Claw Nebula and cataloged as NGC 6334, stars nearly ten times the mass of our Sun have been born there in only the past few million years. Pictured here is a recently released image of the Cat's Paw taken in infrared light by the James Webb Space Telescope. This newly detailed view into the nebula helps provide insight for how turbulent molecular clouds turn gas into stars.
20/07/2025
SANTé/MEDECINE - Cancer du foie : Une corrélation entre cancer du foie et groupe sanguin (3/6)
ASTRONOMY - Lunar Nearside
2025 July 20
Explanation: About 1,300 images from the Lunar Reconnaissance Orbiter spacecraft's wide angle camera were used to compose this spectacular view of a familiar face - the lunar nearside. But why is there a lunar nearside? The Moon rotates on its axis and orbits the Earth at the same rate, about once every 28 days. Tidally locked in this configuration, the synchronous rotation always keeps one side, the nearside, facing Earth. As a result, featured in remarkable detail in the full resolution mosaic, the smooth, dark, lunar maria (actually lava-flooded impact basins), and rugged highlands, are well-known to earthbound skygazers. To find your favorite mare or large crater, just follow this link or slide your cursor over the picture. The LRO images used to construct the mosaic were recorded over a two week period in December 2010.
19/07/2025
ASTRONOMY - Messier 6
2025 July 19
Image Credit & Copyright: Xinran Li
Explanation: The sixth object in Charles Messier's famous catalog of things which are not comets, Messier 6 is a galactic or open star cluster. A gathering of 100 stars or so, all around 100 million years young, M6 lies some 1,600 light-years away toward the central Milky Way in the constellation Scorpius. Also cataloged as NGC 6405, the pretty star cluster's outline suggests its popular moniker, the Butterfly Cluster. Surrounded by diffuse reddish emission from the region's hydrogen gas the cluster's mostly hot and therefore blue stars are near the center of this colorful cosmic snapshot. But the brightest cluster member is a cool K-type giant star. Designated BM Scorpii it shines with a yellow-orange hue, seen near the end of one of the butterfly's antennae. This telescopic field of view spans nearly 2 Full Moons on the sky. That's 25 light-years at the estimated distance of Messier 6.
SANTé/MEDECINE - Cancer du foie : les personnes les plus à risque (2/6)
18/07/2025
SANTé/MEDECINE - Cancer du foie : les personnes les plus à risque (1/6)
LINGUISTIQUE - Les origines de la langue basque - (2/2)
Photographie aérienne du site de l'Irulegi. En B, la zone de fouilles avec l'emplacement de la main d'Irulegi dans le bâtiment 6...
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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 May 11 The Surface of Venus from Venera 14 Image Credit: Soviet Planetary Exploration Program , Venera 14 ; Processing & Copyri...


