Out past Neptune are countless small icy and rocky bodies called Trans-Neptunian Objects (TNOs), and many of these have moons ...

An curved arrow pointing right. See what's so weird about Pluto and its moons. Produced by Emmanuel Ocbazghi. Original reporting by Jessica Orwig. Follow BI Video: On Facebook More from Science ...

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto turns out to have as much complexity as Mars or Earth, so much so that I ...

An curved arrow pointing right. See what's so weird about Pluto and its moons. Produced by Emmanuel Ocbazghi. Original reporting by Jessica Orwig. Follow BI Video: On Facebook More from Science ...

In the earliest days, the Sun and the Moon were counted in ... And if you are still a Pluto-is-a-planet holdout, like we were, [Michael]’s argument that counting all the Trans-Neptunian Objects ...

PhotoPhoto of Pluto and its moon Charon, as seen with the Hubble Space Telescope in 1994. In the same part constellation, Orion, as Betelgeuse but even farther away is the Orion Nebula ...

The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...

Pluto, the International Space Station, and a number of icy moons that orbit the outer planets like Saturn (as seen by the Cassini spacecraft, which just reached the end of its mission at the ...