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Astrobiologie. La vie sur Terre pourrait avoir commencé par des molécules venues du Soleil. L’observation d’une jeune étoile similaire à notre Soleil a permis de détecter des traces des éléments chimiques qui sont les ingrédients de base de la vie telle que nous la connaissons sur notre planète.

Astrobiologie. La vie sur Terre pourrait avoir commencé par des molécules venues du Soleil

“Une molécule organique, considérée comme une des briques à la base de la vie, a été détectée entre les poussières et les gaz entourant une jeune étoile semblable à notre soleil”, dévoile le quotidien italien La Repubblica. C’est la première fois que les astronomes observent ce genre de molécule – l’isocyanate de méthyle - dans une étoile en formation, du même type que celle à partir de laquelle notre système solaire a évolué. Ces observations, conduites par deux équipes internationales en parallèle à partir des données du télescope Alma, au Chili, et publiées dans la revue Monthly Notices of the Royal Astronomical Society, vont aider à comprendre comment la vie est apparue sur Terre. Actuellement, deux théories concurrentes s’affrontent. These seven alien worlds could help explain how planets form.

NASA/ESA/STScI/J. de Wit An artist's illustration shows two Earth-sized planets spinning across the face of an M dwarf star called TRAPPIST-1.

These seven alien worlds could help explain how planets form

Seven alien, Earth-sized worlds bask in the cool, red light of their parent star. The planetary menagerie exists around a star overlooked by other exoplanet hunters, although it is just 12 parsecs (39 light years) from Earth. Astronomers have found other seven-planet systems before, but this is the first to have so many Earth-sized worlds. All of them orbit at the right distance to possibly have liquid water somewhere on their surfaces. We are saddened by the loss of Sen. John Glenn, the first American to orbit Earth. A true American hero. Godspeed, John Glenn. Ad astra. Inside the secretive Chinese space program that could threaten NASA's dominance. About 3.8 billion years ago, huge impacts created the moon's Orientale impact basin. Moon mission shares insights. Day 1 of the #Proxima mission and already one of the new experiments is running! MATISS tests innovating smart surfaces in space #FrenchTech. 1er jour de la mission #Proxima et déjà des expériences de lancées! Avec MATISS je teste des surfaces innovantes dans l'espace #FrenchTech.

When humans reach Mars, we're going to need power. Molten salt reactors could provide it. The @Space_Station is amazing: better than in my best dreams. I wish everybody could get the chance to come up here! #Proxima. The Soyuz launch sequence explained. Gaia mission’s Milky Way map pinpoints locations of billion-plus stars. A new map of the galaxy, the most precise to date, reveals positions on the sky for over 1 billion stars both within and beyond the Milky Way.

Gaia mission’s Milky Way map pinpoints locations of billion-plus stars

This new galactic atlas, courtesy of the European Space Agency’s Gaia spacecraft, also provides distances to roughly 2 million of those stars, laying the groundwork for astronomers who want to piece together the formation, evolution and structure of the Milky Way. “This is a major advance in mapping the heavens,” Anthony Brown, an astrophysicist at Leiden University in the Netherlands, said September 14 at a news briefing.

“Out of the 1 billion stars, we estimate that over 400 million are new discoveries.” There are no major cosmic revelations yet; those will develop in the months and years to come as astronomers pore over the data. Merci #Cygnus pour la livraison! Le bras robotique a manœuvré le véhicule cargo pour son départ de l’#ISS il y a quelques minutes. #Proxima. Here’s the most detailed map of the galaxy to date #GaiaMission. .@PlumGeek's mini Mars rover teaches you to program as you stage missions to unexplored regions of your living room. While Elon Musk is taking care of the rockets, these people are leading the next phase of America's space boom.

NASA Social on Periscope: "NASA Administrator Charles Bolden chats with the #NASASocial group!" NASA just released hundreds of stunning new images of Mars — here are some of the best. The death toll from #HurricaneMatthew tops 1,000 in Haiti. Chandra Finds Evidence for Violent Stellar Merger. Data from NASA's Chandra X-ray Observatory has been used to discover 26 black hole candidates in the Milky Way's galactic neighbor, Andromeda.

Chandra Finds Evidence for Violent Stellar Merger

Credits: X-ray: NASA/CXC/SAO/R. Barnard, Z. Lee et al.; Optical: NOAO/AURA/NSF/REU Program/B. Schoening, V. Harvey and Descubre Foundation/CAHA/OAUV/DSA/V. Using data from NASA's Chandra X-ray Observatory, astronomers have discovered an unprecedented bonanza of black holes in the Andromeda Galaxy, one of the nearest galaxies to the Milky Way. Using more than 150 Chandra observations, spread over 13 years, researchers identified 26 black hole candidates, the largest number to date, in a galaxy outside our own.

Incredible! After a 5-year journey, we're up close and personal with our solar system's largest planet. Welcome to Jupiter, @NASAJuno! Juno snaps its first pic of Jupiter. NASA’s Juno spacecraft has sent back its first picture of Jupiter since arriving at the planet July 4 (SN: 7/23/16, p. 14).

Juno snaps its first pic of Jupiter

The image, taken July 10 when the spacecraft was 4.3 million kilometers from Jupiter, shows off the planet’s clouds, its Great Red Spot (a storm a bit wider than Earth) and three of its moons (Io, Europa and Ganymede). Juno is on the outbound leg of its first of two 53.5-day orbits of the gas giant (Juno will then settle into 14-day orbits). During orbit insertion, all of Juno’s scientific instruments were turned off while the spacecraft made its first dive through the harsh radiation belts that encircle the planet.