Name: 為何地球終有一日將變成火星
Uploaded: 2016-12-20T21:57:10Z
Duration: 11 min 45 s
Description: 每一分鐘，就會有四百磅氫氣和幾乎七磅氦氣從地球大氣層飛向外太空。天體物理理學家——安佳麗．特里帕西研究了大氣逃離的現象。在此次精彩演講中，她介紹為何這個現象會在幾百萬年後的某一天，將我們藍色的地球變成紅色。

安佳麗．特里帕西: 為何地球終有一日將變成火星

為何地球終有一日將變成火星

每一分鐘，就會有四百磅氫氣和幾乎七磅氦氣從地球大氣層飛向外太空。天體物理理學家——安佳麗．特里帕西研究了大氣逃離的現象。在此次精彩演講中，她介紹為何這個現象會在幾百萬年後的某一天，將我們藍色的地球變成紅色。

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.