Nombre total de pages vues
06/07/2025
05/07/2025
LA TERRE VUE DU CIEL - Endeavour quelques minutes avant son amarrage à l'ISS
ASTRONOMY - Ou4: The Giant Squid Nebula
Image Credit & Copyright: Massimo Di Fusco
Explanation: Difficult to capture, this mysterious, squid-shaped interstellar cloud spans nearly three full moons in planet Earth's sky. Discovered in 2011 by French astro-imager Nicolas Outters, the Squid Nebula's bipolar shape is distinguished here by the telltale blue emission from doubly ionized oxygen atoms. Though apparently surrounded by the reddish hydrogen emission region Sh2-129, the true distance and nature of the Squid Nebula have been difficult to determine. Still, one investigation suggests Ou4 really does lie within Sh2-129 some 2,300 light-years away. Consistent with that scenario, the cosmic squid would represent a spectacular outflow of material driven by a triple system of hot, massive stars, cataloged as HR8119, seen near the center of the nebula. If so, this truly giant squid nebula would physically be over 50 light-years across.
04/07/2025
LA TERRE VUE DU CIEL - Houston ; siège du Centre spatial Johnson de la Nasa
ASTRONOMY - NGC 6946 and NGC 6939
2025 July 4
Image Credit & Copyright: Alberto Pisabarro
Explanation: Face-on spiral galaxy NGC 6946 and open star cluster NGC 6939 share this cosmic snapshot, composed with over 68 hours of image data captured with a small telescope on planet Earth. The field of view spans spans about 1 degree or 2 full moons on the sky toward the northern constellation Cepheus. Seen through faint interstellar dust couds near the plane of our Milky Way galaxy, the stars of open cluster NGC 6939 are 5,600 light-years in the distance, near bottom right in the frame. Face-on spiral galaxy NGC 6946 is at top left, but lies some 22 million light-years away. In the last 100 years, 10 supernovae have been discovered in NGC 6946, the latest one seen in 2017. By comparison, the average rate of supernovae in our Milky Way is about 1 every 100 years or so. Of course, NGC 6946 is also known as The Fireworks Galaxy.
SANTé/MEDECINE - Une nouvelle arme contre le cancer - (8/8) - Conclusion : une révolution potentielle en oncologie
03/07/2025
SANTé/MEDECINE - Une nouvelle arme contre le cancer - (7/8) - Un traitement sans résistance ni toxicité
LA TERRE VUE DU CIEL - L'Italie vue de l'Espace
ASTRONOMY - Nova V462 Lupi Now Visible
2025 july 3
Nova V462 Lupi Now Visible
Explanation: If you know where to look, you can see a thermonuclear explosion from a white dwarf star. Possibly two. Such explosions are known as novas and the detonations are currently faintly visible with the unaided eye in Earth's southern hemisphere -- but are more easily seen with binoculars. Pictured, Nova Lupi 2025 (V462 Lupi) was captured toward the southern constellation of the Wolf (Lupus) last week near the central plane of our Milky Way galaxy. Nova Lupi 2025 was originally discovered on June 12 and peaked in brightness about a week later. Similarly, Nova Velorum 2025, toward the southern constellation of the Ship Sails (Vela), was discovered on June 25 and peaked a few days later. A nova somewhere in our Galaxy becomes briefly visible to the unaided eye only every year or two, so it is quite unusual to have two novas visible simultaneously. Meanwhile, humanity awaits even a different nova: T Coronae Borealis, which should become visible in northern skies and is expected to become even brighter.
02/07/2025
RADIOACTIVITé - Le mensonge exemplaire !
Oui, il y a bien eu une contamination en France suite à l'accident de Tchernobyl en avril 1986, malgré certaines affirmations officielles de l’époque qui ont tenté de minimiser l’impact.
SANTé/MEDECINE - Tout savoir sur le coeur humain - 2 - Anatomie du cœur humain
Le cœur comprend quatre cavités : deux oreillettes , situées dans la partie supérieure, et deux ventricules , dans la partie inférieure du c...
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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...

