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 ...
NASA's Transiting Exoplanet Survey Satellite (TESS) has discovered an extraordinary planet that's roughly the size of Earth but is only one-tenth of our planet's age, with half of its surface likely ...
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