Astronomers studied it for clues to how early planets grew, and what Earth might have looked like in its infancy.

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why ...

Once the quirky underdog of our solar system, Pluto held planetary status until 2006 ... the time it takes for Pluto to complete one full rotation on its axis, is about 153 Earth hours or 6.4 ...