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.
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Lava Tubes: The Hidden Cities Beneath the Moon’s Surface!The Moon’s surface is harsh and unforgiving, but beneath it lies a network of massive lava tubes that could serve as natural shelters for future lunar colonies. Arrests are made in connection ...
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