Nombre total de pages vues
22/04/2025
SANTé/MEDECINE - Traitement du cancer du poumon (Nouvelles perspectives) - Vers des thérapies ciblées (6/8)
LA TERRE VUE DU CIEL - Province de XinJiang en Chine vue de l'espace
CRIMINOLOGIE : l'ADN, un outil pour la police scientifique et la justice
ASTRONOMY - Terminator Moon: A Moonscape of Shadows
2025 April 22
Image Credit & Copyright: Rich Addis
Explanation: What's different about this Moon? It's the terminators. In the featured image, you can't directly see any terminator -- the line that divides the light of day from the dark of night. That's because the featured image is a digital composite of many near-terminator lunar strips over a full Moon. Terminator regions show the longest and most prominent shadows -- shadows which, by their contrast and length, allow a flat photograph to appear three-dimensional. The overlay images were taken over two weeks in early April. Many of the Moon's craters stand out because of the shadows they all cast to the right. The image shows in graphic detail that the darker regions known as maria are not just darker than the rest of the Moon -- they are also flatter.
21/04/2025
SANTé/MEDECINE - Traitement du cancer du poumon (Nouvelles perspectives) - un lien surprenant révélé par des chercheurs (5/8)
ASTRONOMY - Galaxy Lenses Galaxy from Webb
2025 April 21
Image Credit: ESA/Webb, NASA & CSA, G. Mahler
Explanation: Is this one galaxy or two? Although it looks like one, the answer is two. One path to this happening is when a small galaxy collides with a larger galaxy and ends up in the center. But in the featured image, something more rare is going on. Here, the central light-colored elliptical galaxy is much closer than the blue and red-colored spiral galaxy that surrounds it. This can happen when near and far galaxies are exactly aligned, causing the gravity of the near galaxy to pull the light from the far galaxy around it in an effect called gravitational lensing. The featured galaxy double was taken by the Webb Space Telescope and shows a complete Einstein ring, with great detail visible for both galaxies. Galaxy lenses like this can reveal new information about the mass distribution of the foreground lens and the light distribution of the background source.
20/04/2025
LA TERRE VUE DU CIEL - Les géoglyphes de Nazca au Pérou
ASTRONOMY - The Orion Nebula in Visible and Infrared
2025 April 20
Image Credit & Copyright: Infrared: NASA, Spitzer Space Telescope; Visible: Oliver Czernetz, Siding Spring Obs.
Explanation: The Great Nebula in Orion is a colorful place. Visible to the unaided eye, it appears as a small fuzzy patch in the constellation of Orion. Long exposure, multi-wavelength images like this, however, show the Orion Nebula to be a busy neighborhood of young stars, hot gas, and dark dust. This digital composite features not only three colors of visible light but four colors of infrared light taken by NASA's orbiting Spitzer Space Telescope as well. The power behind much of the Orion Nebula (M42) is the Trapezium - four of the brightest stars in the nebula. Many of the filamentary structures visible are actually shock waves - fronts where fast moving material encounters slow moving gas. The Orion Nebula spans about 40 light years and is located about 1500 light years away in the same spiral arm of our Galaxy as the Sun.
19/04/2025
SANTé/MEDECINE - Cancer du pancréas : les symptômes qui doivent vous alerter
Astronomy - THACKERAY'S GLOBULES
2026 May 25 Thackeray's Globules Image Credit & Copyright: John Hayes Explanation: What are these strange space globs? Situated in ...
-
Imaginez un monde où le cancer n’est plus une sentence, mais une simple étape à franchir. Grâce à une découverte révolutionnaire, ce rêve es...
-
2026 January 1 Auroral Corona Image Credit & Copyright : Roi Levi Explanation: Cycle 25 solar maximum made 2025 a great year for ...


