While almost everyone knows about Pluto being a dwarf planet, many are not aware that there are five others in our solar ...

For the better part of a century, we believed there were nine planets in our solar system, with Pluto being the farthest from the sun. Since the discovery of more Pluto-sized dwarf planets, that ...

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

The planets are all too hot for life as we know it, but astronomers haven’t given up searching for more planets in Barnard's ...

The largest object is the asteroid belt is the dwarf planet Ceres ... a field-of-view large enough to capture the entire planet It is about five times the distance from the Sun that Earth is ...

A decades-old cosmic mystery may finally be solved. Scientists now suspect that the strange X-ray glow from a distant white ...

Why was Pluto reclassified as a dwarf planet? One might think that it’s purely a matter of size. Mercury, the smallest of the ...

TRAPPIST-1 is a red dwarf star about 40.7 light-years away from Earth. It is of particular interest because it has seven ...

We float through space revolving around the Sun along with seven other planets and five dwarf planets—including Pluto, which was demoted from its planetary status in 2006. Sometimes, we look up ...