The year was 2015. After traveling billions and billions of miles through the Erebus, New Horizons encounters the boatman, and the somber lord of the departed. The spacecraft could have been called ...

The IAU has voted on a series of resolutions on what a planet is and what a planet isn't, and the verdict is... Pluto is not a planet. At least, not a major one. This is a big turnaround from the ...

Pluto — the celestial body, not the beloved Disney character — was demoted from its planetary status in 2006 by the International Astronomical Union (IAU). The argument had been over whether the ...

Use one of the services below to sign in to PBS: You've just tried to add this video to My List. But first, we need you to sign in to PBS using one of the services below. You've just tried to add this ...

An artist's rendition of the eight planets in our solar system. The planets are depicted closer together than they really are. NASA / JPL Nearly two decades after Pluto got kicked out of the planet ...