The first definition would allow Pluto, along with Ceres and all of Pluto's co-orbital friends, to become planets. The latter ...

An curved arrow pointing right. We all know Neil deGrasse Tyson's stance on Pluto and its status as a planet. But what does the world renowned astrophysicist consider to be the most underrated planet?

much as Ceres had seemed before the other asteroids were discovered. But then, starting in 1995, astronomers with better instruments began to find Pluto's nearby relatives. Soon, they had ...