Emmanuel Sellier

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For First Time, Astronomers Read Exoplanet's Color

Astronomers have determined that an alien planet is blue like Earth.<p><b>A giant gaseous planet that's orbiting a star 63 light-years away is a deep cobalt blue that's reminiscent of Earth's color as seen from space, scientists say, marking the first time an exoplanet's true color has been …

Snow Lines Around a Young Star

Snow lines in space give astronomers clues to planet formation.<p><b>A group of researchers has finally found the perfect snow line. But rather than wielding skis and snowboards, they've been using a giant array of radio antennas—called ALMA—pointed at the cosmos.</b><p>On Earth, a snow line is where snow and …

7 Sky Events This Week: Luna Joins Lord of the Rings and the God of War

Wildlife<p>This week the Cassini orbiter will take a special back-lit shot of Saturn, like this one taken in 2006, but this time a tiny Earth will also pose alongside the ringed-planet. Credit: NASA/JPL-Caltech/Space Science Institute<p><b>This week skywatchers get a chance to track down some of the</b> …

Earth’s Gold Forged in Stellar Collisions

<b>Until today, astronomers believed that all the gold on Earth, and in the universe, was forged in ancient supernova explosions. But new evidence points to a far more violent birth for this most precious metal.</b><p>The new culprit is the cataclysmic collision of two neutron stars. The impact produces a …

Why Ancient Earth Was So Warm

Greenhouse gases in the atmosphere kept the planet toasty, model shows.<p><b>Some three to four billion years ago, Earth was about as warm as it is today, but the sun was much dimmer.</b><p>This so-called faint young sun paradox, first identified by astronomer Carl Sagan in the early 1970s, has flummoxed many a …

New Night Sky Timelapse Video: Stars and Storms Vie for Attention

Changing Planet<p>Breathtaking shots of the ground and sky dominate this striking time-lapse video shot in South Dakota and Wyoming between April and October of 2012 by veteran photographer Randy Halverson.<p>One highlight: the footage shows the Milky Way galaxy’s bright central hub — located more than …

60 milliards de planètes potentiellement habitables dans la galaxie ?

L’espace fascine. Malheureusement, nous sommes encore cloués au sol et il faudra un moment avant d’aller explorer les étoiles. Mais nous pouvons …