When astronomers announced Kepler-452b, they were not just adding another distant world to a growing catalog. They were pointing to a planet that orbits a star much like our own, in a region where ...

NASA’s announcement of the discovery of a new extrasolar planet has been met with a lot of excitement. But the truth is that it is impossible to judge whether it is similar to Earth with the few ...

It may not be Earth's exact twin, but it's a pretty close cousin. NASA's Kepler space telescope has spotted the most Earth-like alien planet yet discovered — a world called Kepler-452b that's just ...