An animation by planetary scientist James O'Donoghue reveals that Earth has two types of day: sidereal days and solar days. The sidereal day happens each time Earth completes a 360-degree rotation ...

The International Rotation and Reference Systems Service found that July 9, July 22, and August 5 will be victims of the time ...

On the right-hand side is dots that show how fast each object travels 150 kilometers (93 miles). Here's a quick answer to how it all works: the Earth orbits the Sun at 66,600 mph, the Sun orbits ...

An animated film that reveals the beauty of the sun's interactions with Earth is one of the winners of an international contest in science visualization.