What would an alien 'Earth' look like around the star next door?

In a new study, researchers predict what an alien "Earth" could really look like, and how it could evolve (if one exists). In the search for evidence of life elsewhere in the universe, scientists have searched for planets similar to our own. Our closest stellar neighbor, the Alpha Centauri system, holds an exoplanet that scientists think could be "Earth-like": Proxima b. This exoplanet lies in the habitable zone, or "Goldilocks zone," around its star, meaning it orbits its star at a distance that is close enough that liquid water could exist (without being so close to the star that the water vaporizes).

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