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17/07/2025
SANTé/MEDECINE - Détecter le cancer dans les analyses de sang - (7/7) - Conclusion : Un avenir plein d’espoir
ASTRONOMY - 3I/ATLAS
Image Credit: Gemini Observatory/NOIRLab/NSF/AURA/K. Meech (IfA/U. Hawaii)
Processing: Jen Miller, Mahdi Zamani (NSF/NOIRLab)
Explanation: Discovered on July 1 with the NASA-funded ATLAS (Asteroid Terrestrial-impact Last Alert, System) survey telescope in Rio Hurtado, Chile, 3I/ATLAS is so designated as the third known interstellar object to pass through our Solar System It follows 1I/ʻOumuamua in 2017 and the comet 2I/Borisov in 2019. Also known as C/2025 N1, 3I/ATLAS is clearly a comet, its diffuse cometary coma, a cloud of gas and dust surrounding an icy nucleus, is easily seen in these images from the large Gemini North telescope on Maunakea, Hawai‘i. The left panel tracks the comet as it moves across the sky against fixed background stars in successive exposures. Three different filters were used, shown in red, green, and blue. In the right panel the multiple exposures are registered and combined to form a single image of the comet. The comet's interstellar origin is also clear from its orbit, determined to be an eccentric, highly hyperbolic orbit that does not loop back around the Sun and will return 3I/ATLAS to interstellar space. Not a threat to planet Earth, the inbound interstellar interloper is now within the Jupiter's orbital distance of the Sun, while its closest approach to the Sun will bring it just within the orbital distance of Mars.
16/07/2025
LA TERRE VUE DU CIEL - Nuages vus de l'ISS
SANTé/MEDECINE - Détecter le cancer dans les analyses de sang - (6) - Les défis à relever pour un accès universel
ASTRONOMY - The Rosette Nebula from DECam
2025 July 16
Image Credit: CTIO, NOIRLab, DOE, NSF, AURA; Processing: T. A. Rector (U. Alaska Anchorage), D. de Martin (NSF’s NOIRLab) & M. Zamani
Explanation: Would the Rosette Nebula by any other name look as sweet? The bland New General Catalog designation of NGC 2237 doesn't appear to diminish the appearance of this flowery emission nebula, as captured by the Dark Energy Camera (DECam) on the Blanco 4-meter telescope at the NSF's Cerro Tololo Inter-American Observatory in Chile. Inside the nebula lies an open cluster of bright young stars designated NGC 2244. These stars formed about four million years ago from the nebular material and their stellar winds are clearing a hole in the nebula's center, insulated by a layer of dust and hot gas. Ultraviolet light from the hot cluster stars causes the surrounding nebula to glow. The Rosette Nebula spans about 100 light-years across, lies about 5000 light-years away, and can be seen with a small telescope towards the constellation of the Unicorn (Monoceros).
15/07/2025
NUCLEAIRE - Rejets de tritium dans votre commune
- Hérault
- Ille-et-Vilaine
- Indre
- Indre-et-Loire
- Isère
- Jura
- Landes
- Loir-et-Cher
- Loire
- Haute-Loire
- Loire-Atlantique
- Loiret
- Lot
- Lot-et-Garonne
- Lozère
- Maine-et-Loire
- Manche
- Marne
- Haute-Marne
- Mayenne
- Meurthe-et-Moselle
- Meuse
- Morbihan
- Moselle
- Nièvre
- Nord
- Oise
- Orne
- Pas-de-Calais
- Puy-de-Dôme
- Pyrénées-Atlantiques
- Hautes-Pyrénées
- Pyrénées-Orientales
- Bas-Rhin
- Haut-Rhin
- Rhône
- Haute-Saône
- Saône-et-Loire
- Sarthe
- Savoie
- Haute-Savoie
- Paris
- Seine-Maritime
- Seine-et-Marne
- Yvelines
- Deux-Sèvres
- Somme
- Tarn
- Tarn-et-Garonne
- Var
- Vaucluse
- Vendée
- Vienne
- Haute-Vienne
- Vosges
- Yonne
- Territoire de Belfort
- Essonne
- Hauts-de-Seine
- Seine-St-Denis
- Val-de-Marne
- Val-D’Oise
- DROM-COM : Guadeloupe, Martinique, Guyane, Réunion, Mayotte, St-Barthélemy, St-Martin
LA TERRE VUE DU CIEL - La cordillère des Andes - chaîne de montagnes
SANTé/MEDECINE - Détecter le cancer dans les analyses de sang - (5) - Les témoignages qui bouleversent
ASTRONOMY - Collapse in Hebes Chasma on Mars
025 July 15
Image Credit & License: ESA/DLR/FU Berlin (G. Neukum)
Explanation: What's happened in Hebes Chasma on Mars? Hebes Chasma is a depression just north of the enormous Valles Marineris canyon. Since the depression is unconnected to other surface features, it is unclear where the internal material went. Inside Hebes Chasma is Hebes Mensa, a 5 kilometer high mesa that appears to have undergone an unusual partial collapse -- a collapse that might be providing clues. The featured image, taken by ESA's robotic Mars Express spacecraft currently orbiting Mars, shows great details of the chasm and the unusual horseshoe shaped indentation in the central mesa. Material from the mesa appears to have flowed onto the floor of the chasm, while a possible dark layer appears to have pooled like ink on a downslope landing. One hypothesis holds that salty rock composes some lower layers in Hebes Chasma, with the salt dissolving in melted ice flows that drained through holes into an underground aquifer.
14/07/2025
ASTRONOMY - NGC 2685: The Helix Galaxy
2025 July 14
Image Credit & Copyright: Stefan Thrun
Explanation: What is going on with this galaxy? NGC 2685 is a confirmed polar ring galaxy - a rare type of galaxy with stars, gas and dust orbiting in rings perpendicular to the plane of a flat galactic disk. The bizarre configuration could be caused by the chance capture of material from another galaxy by a disk galaxy, with the captured debris strung out in a rotating ring. Still, observed properties of NGC 2685 suggest that the rotating helix structure is remarkably old and stable. In this sharp view of the peculiar system also known as Arp 336 or the Helix galaxy, the strange, perpendicular rings are easy to trace as they pass in front of the galactic disk, along with other disturbed outer structures. NGC 2685 is about 50,000 light-years across and 40 million light-years away in the constellation of the Great Bear (Ursa Major).
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...



