Suppose humanity was faced with an extinction-level event. Not just high odds, but certain-sure. A nearby supernova will explode and irradiate all life, a black hole will engulf the Earth, a Mars ...

which have been argued to be potentially habitable worlds with a hydrogen atmosphere overlying a water ocean. However, the internal temperatures of such exoplanets, if high enough, could lie ...

Mar. 17, 2025 — The James Webb Space Telescope has captured its first direct images of carbon dioxide in a planet outside the solar system in HR 8799, a multiplanet system 130 light-years away ...