Gravity is one of the four fundamental forces in the universe, alongside electromagnetism and the strong and weak nuclear forces. Despite being all-pervasive and important for keeping our feet...

To summarize, according to Einstein, gravity is the curving of spacetime by all the objects in it, combined with the "geodesic" (straight) motions of those objects through the spacetime.

Gravity is a force that attracts a body towards the centre of the earth or any other physical body having mass. History of Gravity In 1687, Sir Isaac Newton first discovered gravity.

Learn what gravity is, how it works, and how it varies on Earth and in space. Explore the history of gravity, from Aristotle to Einstein, and the challenges of measuring and understanding this fundamental force.

Gravity - Newton's Law, Universal Force, Mass Attraction: Newton discovered the relationship between the motion of the Moon and the motion of a body falling freely on Earth. By his dynamical and gravitational theories, he explained Kepler’s laws and established the modern quantitative science of gravitation.

Gravity is just geometry, the result of the curvature by massive objects of the space and time around them. The strength of the gravitational “ field ” at any point in space or time is just the...

The most familiar is gravity and it holds your feet down to the ground because the mass of the planet exerts a fundamental force on the mass of your body. In fact, gravity stirs up an attraction between any two objects in the universe: moons , dust motes, coyotes -- you name it.

Move the sun, earth, moon and space station to see how it affects their gravitational forces and orbital paths. Visualize the sizes and distances between different heavenly bodies, and turn off gravity to see what would happen without it!

Learn how Einstein's general relativity explains gravity and its effects on light, space, and time. Explore how astronomers test GR with observations of black holes, gravitational waves, lensing, and more.