Proxima b, the nearest known alien planet, maybe even more Earth-like than previously thought. New observations suggest that the closest alien planet to our solar system is even more Earth-like than scientists previously thought. An international team of researchers discovered in a new study that the minimum possible mass for Proxima b, which is only 4.2 light-years from Earth, is only 17% more massive than our planet.

Previously, scientists believed that this exoplanet, which is in its star's habitable zone, had a minimum mass of about 1.3 Earth masses. The new measurement suggests that Proxima b may be even more similar to Earth, at least in size, than previous observations suggested.

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