Besides quantum theory, general relativity is one of two pillars of modern physics – our working theory of gravity and of the very large, of planets, galaxies and the universe as a whole.

In classical (or "Newtonian") mechanics, which describes the motion of macroscopic objects (i.e., things larger than an atom, such as planets), gravity is sometimes called a central force.

A spectacular celestial event is set to captivate the night sky this week as all seven planets in our solar system align in a ...

Since it is a force, weight is measured in Newtons (not kilograms). The force of gravity is different on different planets, so the weight of an object on different planets (or moons) is different ...

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's responsible for the orbits of the planets and their satellites ...

Various interplanetary spacecraft can use the specific positioning of planets to perform gravity assists, effectively slingshotting them with a speed boost toward their final destination.

We commonly experience gravity by being pulled downwards by the Earth. Gravity keeps all of the planets (including Earth) in orbit around the Sun. It also keeps the Moon in orbit around the Earth.