Yoann Le Gruiec

Four and a half billion years ago, the young Earth was a hellish place-a seething chaos of meteorite impacts, volcanoes belching noxious gases, and lightning flashing through a thin, torrid...

NASA launches its most ambitious hunt for traces of life on Mars, landing a car-sized rover in a rocky, ancient river delta. The rover will stow samples for possible return to Earth and test technology that may pave the way for human travel to Mars.

After decades of amazing discoveries, spacecraft Cassini embarks on its final - and most daring - mission: a dive below Saturn's rings.

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