Does our Solar System have 9 planets or only 8? Astronomers have gone back and forth on that a lot, with Pluto now being classified as a dwarf planet. However, out beyond Neptune there could be ...

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known ...

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but with a telescope you can spot Neptune and Uranus.

Hubble Space Telescope observations of white dwarf star G238-44 has shown that it is "consuming both rocky-metallic and icy ...

According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to ...

While this parade of planets look to our eyes to be huddled in the evening sky, they are of course spread out across a vast chasm of space across the solar system, separated from each other by ...

A new type of exoplanet has been discovered: Enaiposha, also known as GJ 1214 b. Long heralded as a mini-Neptune, new observations have indicated that it is a member of a category never seen before ...