like Earth's moon, orbit another planet in the Solar System. This strengthened his belief that the claim previously published by Nicolaus Copernicus was correct, according to which it was not Earth ...

But is our moon actually a planet? The answer is technically ... can be to define terms in astronomy," Grayson said. "Most things in the universe exist not in neat boxes but rather on a spectrum ...

However, there is still a great deal we don't know about the universe. To put this into context, the "normal" matter around us that makes up stars, planets, moons ... star we are most familiar ...

A new study implies that in the past, moons in our solar system may have had rings just like planets do — deepening the ...

Mars will seem to disappear behind the full wolf moon Monday for many sky-gazers. Throughout January, also look up to see ...

Explore the universe with news on fascinating ... how Pluto acquired its unusually large moon Charon, which is about half the size of the dwarf planet. Now, new research suggests that Pluto ...