Add Yahoo as a preferred source to see more of our stories on Google. As elementary schoolers, we learned the order of the planets. Maybe your teacher even had a snappy mnemonic like “My Very Educated ...

It's been 20 years since Pluto lost its status as the ninth planet of the solar system, but we still can't seem to let it go.

A new formation theory for Pluto's moon Charon could explain why Pluto is geologically active. Illustration incorporates NASA New Horizons terrain imagery. Pluto — demoted to dwarf planets status in ...

NASA chief Jared Isaacman’s call to restore Pluto’s planetary status has reignited a long-running scientific debate over ...

NASA's new chief wants to reinstate Pluto as a planet. And scientists are on board – as long as you're also okay with having ...

It's been 20 years since Pluto was declassified as the ninth planet in our solar system, and many people wish it had never lost its status. A recent comment from NASA Administrator Jared Isaacman ...

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists —... Pluto isn't a planet — but it gives us clues for how the ...

If confirmed, the rock would become just the second world past Neptune in our solar system to host an atmosphere.

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 ...

Pluto hasn't been a planet for almost 20 years. In the early 2000s, scientists discovered several objects of a similar size to Pluto. So, during the summer of 2006, members of the International ...