Ask Ethan: Are 'super-Earths' really the most common planets in the Universe?. In terms of the planets we've discovered, super-Earths are by far the most common. What does that mean for the Universe?.
The most common "sized" world in the galaxy is a super-Earth, between 2 and 10 Earth masses, such as Kepler 452b, illustrated at right. But the illustration of this world as "Earth-like" in any way may be…