安贾莉·特里帕蒂: 为什么地球有朝一日可能会变成火星

为什么地球有朝一日可能会变成火星

每分钟，都有400磅的氢气和将近七磅的氦气从地球大气层逃逸到外太空。天体物理学家安贾莉·特里帕蒂研致力于研究大气逃逸现象。在这个引人入胜、深入浅出的演讲中，她讨论了在未来（距今几十亿年后），这一过程可能会如何把我们的蓝色星球变为红色。
TEDx 由地区社群独立举办，演讲采取TED会议形式。更多相关信息：http://ted.com/tedx

Atmospheric escape is quietly transforming planets, including our own, as gases like hydrogen and helium drift away into space every minute. On Earth, about 400 pounds of hydrogen vanish every sixty seconds, shaping the fate of our atmosphere over billions of years. Mars once had a thicker, wetter environment, but lost its air and water to space, turning into the dry, red world we see today. Studying this process on Earth, Mars, and distant exoplanets reveals how stars chip away at planetary atmospheres and hints at the eventual fate of our blue planet.