Standing on Earth's surface, the planet's mass creates a gravitational force sufficient to accelerate any object downward ...

Standing on Earth's surface, the planet's mass creates a gravitational force sufficient to accelerate any object downward (toward the core of the planet, or perpendicular to the planet's surface ...

We don’t know what gravity is. Say that to the average person, and the answer you’ll probably get is some version of: “What are you talking about? Gravity is the force of attraction that ...

Quantum mechanics tells us that the forces of nature come in discrete, tiny chunks. Gravity, the bending of space-time, is a force. So is space-time quantized as well?

Just as a boat creates waves on a lake as it slices forward through the water, stars and other bodies in the universe create ripples in the fabric of space-time, called gravitational waves.

A: I have flown many times in zero-gravity airplane flights. Each time I still enjoy the feeling of floating free, the ability to fly across the cabin from just one gentle push on the wall, just ...