Many people hold Pluto close in their hearts and refuse to abandon the assertion that it is a planet, although science ...

At just 23 years old, Tombaugh sent his drawings, unsolicited ... the discovery of a new planet. The search for Pluto did not begin with Clyde Tombaugh, to be fair. That distinction belongs ...

It must have enough mass to draw itself into a round shape ... the committee declared that Pluto no longer qualified as a planet because of its position in the cluttered Kuiper Belt, where ...