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

Ars Technica
By John TimmerJul 16, 2026, 2:00 pm81 ptsTrending
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…

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