We've seen helium baked off a rocky exoplanet's atmosphere

我们已经看到氦从岩石系外行星的大气中被烘烤掉

作者: John Timmer | 分类: Science, astronomy, exoplanets, Helium | 原文: arstechnica.com

时间: Thu, 16 Jul 2026 18:00:15 +0000

Most of the gas in the Universe is a mixture of hydrogen and helium. It's thought that the initial atmospheres of most planets also start out that way. However, over billions of years, as planets evolve, the composition of their atmospheres may shift. Hydrogen can react with other chemicals, and both it and helium can be lost to space. Venus, Earth, and Mars are thought to have second atmospheres, with their original hydrogen/helium envelopes having been lost and/or transformed.

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