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

One of the latest mysteries captivating scientists and space enthusiasts alike is the potential discovery of a ninth planet beyond Pluto. Although Pluto was demoted to the status of a dwarf planet ...

The five-part behind-the-scenes special, Beyond the Gates: Welcome to the Neighborhood, is also available to stream on Pluto ...

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

Related: New Horizons: Exploring Pluto and beyond That report also noted that "moving outward, the boundary of the solar system where the sun's influence wanes and is replaced by the interstellar ...

For decades, it captivated imaginations with its icy surface and distant orbit beyond Neptune. But in 2006, Pluto’s planetary reign came to an end when the International Astronomical Union ...