The search for alien life has recently taken a surprise twist away from Mars and toward Europa, an ice ball of a moon in orbit around Jupiter. To understand why, you just need to look at these three numbers: ZERO, 1.33 BILLION, 3 BILLION
The first is the volume of known water on Mars (sorry,permafrost and billion-year-old riverbeds don’t count).The second is the volume of water on Earth, measured in cubic kilometers. The third is the inferred volume of water sloshing around just beneath Europa’s frozen surface. Sure, Mars may have had oceans billions of years ago, but Europa has them right now—and they are more than twice as large as all of Earth’s oceans combined.
この記事は Popular Science の September 2015 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
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この記事は Popular Science の September 2015 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
すでに購読者です? サインイン
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