By trapping huge amounts of water on land, big dams built by humans have slightly changed how Earth spins and where its poles ...

Earth’s rotation is gradually slowing down, a process that has been quietly shaping the planet since its formation 4.5 billion years ago. This deceleration, caused by the gravitational pull of the ...

If you’re the kind of person who gets a lot done, you’re grateful for every one of the 86,400 seconds that make up a day. On July 9, however, as well as on July 22, and August 5, you won’t get your ...

Right now, as a passenger on planet Earth, you’re zooming through space at incredible speeds. But why can't you feel it?

A globe was the first thing I ever bought with my own money. I was maybe 5 years old, and I was really excited to take it home. As I quickly discovered, you can spin it in the direction that the earth ...

How do you explore the interior of a planet without ever touching down on it? Start by watching the way the planet spins, then measure how your spacecraft orbits it — very, very carefully. This is ...