If Earth had an evil twin, it might look something like the recently-discovered lava-Earth HD 63433d. HD 63433d is a rocky world almost exactly the same size as our Earth, orbiting a star almost ...
The relative sizes of the three known planets in the HD 63433 system, with the young Earth-like planet with a lava surface closest to the star. The other two planets are mini-Neptunes. Astronomers ...
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