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08/07/2025

LA TERRE VUE DU CIEL - Coucher de Soleil sur l'Amazone


Avec leur 6500 kilomètres, les fleuves Amazone et le Nil sont les plus longs au monde.

Cette scène montre une région brésilienne traversée par l'Amazone et parsemée de nombreux lacs sur sa plaine d'inondation.

Nasa

ASTRONOMY - The Pleiades in Red and Blue

 2025 July 8

A cluster of bright blue stars is seen near the bottom
of this starfield. Nebula around the stars is blue near
the stars but red elsewhere. 
Please see the explanation for more detailed information.

The Pleiades in Red and Blue
Image Credit & Copyright: Ogetay Kayali (Michigan Tech U.) Text: Ogetay Kayali (Michigan Tech U.)

Explanation: If you have looked at the sky and seen a group of stars about the size of the full Moon, that's the Pleiades (M45). Perhaps the most famous star cluster in the sky, its brightest stars can be seen even from the light-polluted cities. But your unaided eye can also see its nebulosity -- the gas and dust surrounding it -- under dark skies. However, telescopes can catch even more. The bright blue stars of the Pleiades, also known as the Seven Sisters, light up their surrounding dust, causing it to appear a diffuse blue that can only be seen under long exposures. But that's not all. The cosmic dust appears to stretch upward like ethereal arms. And the entire structure is surrounded by a reddish glow from the most abundant element in the universe: hydrogen. The featured image is composed of nearly 25 hours of exposure and was captured last year from Starfront Observatory, in TexasUSA

07/07/2025

LA TERRE VUE DU CIEL - New York vue de l'ISS


La ville de New York photographiée en 2010 depuis la Station spatiale internationale au cours de l'Expédition 24.

© Fyodor Yurchikhin/Russian Space Agency Press Services

ASTRONOMY - Interstellar Comet 3I/ATLAS

 2025 July 7

A drawing of our Solar System shows the orbits of 
Jupiter and interior planets. A white line shows the 
trajectory of passing comet 3I/ATLAS.
Please see the explanation for more detailed information.

Interstellar Comet 3I/ATLAS
Image Credit: NASAJPL-Caltech

Explanation: It came from outer space. An object from outside our Solar System is now passing through at high speed. Classified as a comet because of its gaseous coma, 3I/ATLAS is only the third identified macroscopic object as being so alien. The comet's trajectory is shown in white on the featured map, where the orbits of JupiterMars, and Earth are shown in gold, red, and blue. Currently Comet 3I/ATLAS is about the distance of Jupiter from the Sun -- but closing, with its closest approach to our Sun expected to be within the orbit of Mars in late October. Expected to pass near both Mars and Jupiter, 3I/ATLAS is not expected to pass close to the Earth. The origin of Comet 3I/ATLAS remains unknown. Although initial activity indicates a relatively normal comet, future observations about 3I/ATLAS' composition and nature will surely continue.

06/07/2025

LA TERRE VUE DU CIEL - Le triangle Turin - Marseille - Lyon


Cette image a été acquise alors que la Station spatiale survolait la frontière entre la Belgique et la France. Elle montre le triangle formé des villes de Turin, en Italie et les françaises Marseille et Lyon (au premier plan).

La Corse est également visible tout comme la Lune qui se reflète dans la mer Ligurienne.

Nasa

AS TRONOMY - The Spiral North Pole of Mars

 2025 July 6

A computer construction of what the north pole of
Mars looks like. The picture was constructed from measured
altitude data. A spiral landscape is seen that is colored
red but is mostly covered with white ice. 
Please see the explanation for more detailed information.

The Spiral North Pole of Mars
Image Credit: ESA/DLR/FU BerlinNASA MGS MOLA Science Team

Explanation: Why is there a spiral around the North Pole of Mars? Each winter this pole develops a new outer layer about one meter thick composed of carbon dioxide frozen out of the thin Martian atmosphere. This fresh layer is deposited on a water-ice layer that exists year round. Strong winds blow down from above the cap's center and swirl due to the spin of the red planet -- contributing to Planum Boreum's spiral structure. The featured image is a perspective mosaic generated in 2017 from numerous images taken by ESA's Mars Express and elevations extracted from the laser altimeter aboard NASA's Mars Global Surveyor mission.

MUSIC - Eric Serra - The big blue

"The big blue"

05/07/2025

LA TERRE VUE DU CIEL - Endeavour quelques minutes avant son amarrage à l'ISS


Cette image a cela d'intéressant qu'elle permet de distinguer trois des couches qui composent l'atmosphère.

La troposphère apparait en orange. C'est dans la partie supérieure de cette couche que naissent la majorité des phénomènes météo. Juste au-dessus, la stratosphère, de couleur blanchâtre, puis la mésosphère.

Nasa

ASTRONOMY - Ou4: The Giant Squid Nebula

2025 July 5
See Explanation.  Clicking on the picture will download
the highest resolution version available.

Ou4: The Giant Squid Nebula
Image Credit & CopyrightMassimo 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


Houston n'est pas seulement la ville qui abrite le siège des vols habités de la Nasa. Elle est également connue pour être la capitale mondiale de l'énergie.

Si l'on peut facilement distinguer la ville de Houston et son agglomération, les raffineries de pétrole sont également visibles. Ce sont les zones dont la lumière est la plus ....dorée.

Nasa

SANTé/MEDECINE - Détecter le cancer dans les analyses de sang - (4) - Des bénéfices extraordinaires pour la santé publique

Un espoir pour des millions de personnes. Cette découverte représente une lueur d’espoir pour tous ceux qui redoutent le cancer. En détectan...