No way out? Aliens on 'Super-Earth' planets may be trapped by gravity

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No way out? Aliens on 'Super-Earth' planets may be trapped by gravity "Super-Earth" planets are giant-size versions of Earth, and some research has suggested that they're more likely to be habitable than Earth-size worlds. But a new study reveals how difficult it would be for any aliens on these exoplanets to explore space.
April 23, 2018 at 10:51PM