We've known for over 30 years that there are other stellar systems in our galaxy, but we don't have any idea how many there ...

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 ...

Not fulfilling the second criteria, Pluto went from being the ninth planet in our solar system to one of five dwarf planets, with the IAU stating that Pluto is "an important proto-type of a new ...

Four small, newly discovered worlds are less than six light-years away from Earth, and their discovery reinforces a ...

Together, dwarf planets can help scientists learn a lot about ... Miriam Kramer Miriam Kramer worked as a staff writer for Space.com for about 2.5 years before joining Mashable to cover all ...

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

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 ...

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