In 2006, Pluto lost its status as a planet when other bodies in the solar system of similar or greater size were found. The decision to demote it to a ‘dwarf planet’ by the International Astronomical ...

A mission to Pluto that has been canceled twice and was not funded in this year’s NASA budget appears to be set for liftoff again after a House Appropriations subcommittee that oversees NASA funding ...

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 ...

WASHINGTON – Tucson scientist David Grinspoon joined a panel recently talking about NASA’s New Horizons mission to Pluto – but the scientists were most animated when talking about the feud over the ...

This story is part of Short Wave's series Space Camp about all the weird, wonderful things happening in the universe. Check out the rest of the series. If you were born in the last century you might ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. For three-quarters of a century, schoolkids learned that our solar system has nine planets: ...