The Moon slows down the Earth's rotation a little every year. What would happen if it stopped completely? An astrophysicist ...

When you look up at the night sky, you see a peaceful scene where stars twinkle quietly and the Earth seems to float alone in ...

Earth's shape can be tested in surprisingly simple ways without relying on space photographs. The strongest part of the evidence is how many independent observations lead to the same answer.

A quick look at Earth’s rotation and what keeps our planet spinning.