Once the quirky underdog of our solar system, Pluto held planetary status until 2006, when it got a cosmic demotion that still stings space fans. Discovered in 1930, Pluto was the ninth planet for ...

Pluto might be small and distant, but it keeps surprising scientists. After the New Horizons spacecraft zipped past it in 2015, we got our first real look at its icy landscape and unexpectedly active ...

The planet in the cornfield -- Fellow wanderers -- The search for planet X -- Pluto and its little pals -- The meaning of a moon -- There goes the neighborhood -- Not yet explored -- Betting on the ...