This colorful image of the Helix nebula may mirror what someday could become of our sun and our home planet. Released on ...

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 Helix Nebula, also known as Caldwell 63, is located 650 million light-years from Earth. It is the glowing remains of a dying star, much like our Sun.

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 ...

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

A surprising chemical difference between Pluto and Sedna, another dwarf planet in the distant Kuiper Belt, is helping ...

New research suggests that life could have the time and energy to arise on Earth-like worlds in the rapidly shrinking ...

Each of the planets, labeled b, c, d, and e, has a mass between 20% and 30% of Earth's, making them among the smallest yet ...