Why do planets form in the sizes they do, and is there life beyond Earth? A new discovery might help find out
-270 might not seem special. There are three of them, orbiting a star 73 light-years away. This is neither the closest system known, nor does it contain the most Earthlike exoplanet. It has, though, sent a buzz through astronomy., an American instrument launched in 2018. Its innermost world is a super-Earth, a rocky planet a little bigger than Earth that scurries around its parent star once every three days.
All this radiation would be bad for any life that had already developed on a nearby planet, but might, paradoxically, encourage life to emerge in the first place. Some think that ultraviolet light falling on the early Earth provided the energy needed to make the complex organic molecules that were life’s precursors. Mature M-dwarfs do not produce enough ultraviolet for this to happen. But adolescent ones might.—some of which made the stars temporarily 30 times brighter than normal.
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