On TRAPPIST-1b, it's a sweltering 446 degrees Fahrenheit—but only on one side.
Trained on TRAPPIST-1b, Webb found the planet was very hot: Its dayside temperature is roughly 446 degrees Fahrenheit, more than double the boiling point of water. If the planet had an atmosphere, the heat on its dayside would be circulated throughout the planet; instead, the planet is very hot on one side and cold on the other.
“No thick atmosphere on planet c could mean that it is difficult for M star planets to have atmospheres,” Greene added.the TRAPPIST-1 system will no doubt be a recurring target oftheories about exoplanets and red dwarf systems.
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