Life
Tides turn some habitable planets hellish
Planets in the Goldilocks zone around many small stars would be heated up so much by the stars' gravitational tugs that their water would evaporate
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Planets in the Goldilocks zone around many small stars would be heated up so much by the stars' gravitational tugs that their water would evaporate
Curious features on Jupiter's icy moon Europa show where liquid water once appeared close to the surface, making them intriguing targets for alien hunters