NASA’s James Webb Telescope found a Saturn-sized planet with Earth-like temperatures and a methane-rich atmosphere

Somewhere between the scorching extremes of hot Jupiters and the frozen depths of gas giants like Saturn lies a planet that astronomers have spent years looking for and struggling to study: a temperate giant, large enough to qualify as a gas world but sitting in a temperature range that, by the standards of the universe, is almost unremarkable. That planet now has a name, a confirmed atmosphere, and a chemical fingerprint.

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