When gravity is stronger, the objects—a.k.a. test masses—fall faster. Earth’s gravity isn’t constant—it changes subtly all the time as mass shifts around the planet.

NASA has selected 25 finalists in its search for a zero-gravity indicator for the Artemis II mission in 2026. The finalists ...

Fluids float. So do people. That makes delivering a baby and caring for one a much messier and more complicated process than on Earth, where gravity helps with everything from positioning to feeding.

This fall, an asteroid will be pulled into Earth’s gravity as a temporary “ mini-moon.” While it and others are — thankfully — floating peacefully in space for now, asteroids pack a ...

Earth's oceans have topographic features and are held down by gravity, not contained by a giant Antarctic ice wall.

And that’s a good thing. Gravity keeps you on Earth; otherwise, you would float away into space. But gravity also makes it difficult to leave Earth if you’re a rocket heading for space.