All of our solar system's planets are lining up to take part in a rare and awesome event in the night sky - this is when and ...

The Red Planet will be at its closest point to Earth, also known as perigee, on Jan. 12 and will be exactly opposite the sun ...

To have four bright planets visible in the winter night sky is a cool skywatching event to share with friends and family.

But if you went to Venus, that wouldn't be the case. Not every planet has a moon — so why do some planets have several moons, while others have none? I'm a physics instructor who has followed ...