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Super-Earth's Long Orbit Makes It Only Occasionally HabitableThe exoplanet HD 20794d swoops in and out of its habitable zone every few hundred days, making for an extreme climate.
The Blue Ghost lunar mission has captured a gorgeous image of Earth as it ramps up its journey toward the moon.
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Newly discovered super-Earth orbits in and out of its star's habitable zone. Could life survive its extreme climate?Located less than 20 light years away, HD 20794d could potentially be one of the most Earth-like planets found so far, ...
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