“A steam world exoplanet with an earthlike atmosphere?”

- GJ 9827 d is an exoplanet orbiting a red dwarf star, some 98 light-years away. It’s about twice the size of Earth and searing hot.
- It’s the smallest exoplanet so far where water vapor has been detected. But does it have a hydrogen atmosphere, or a more earthlike atmosphere?
- New results from the Webb space telescope suggest an atmosphere dense with heavy molecules. This includes even more water vapor than first thought, suggesting the hot planet is a “steam world.”
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