As gravitational force fundamentally involves the warping of space-time itself, it enables all objects to interact with each other, whether they have mass or not. Massless photons, for example ...

The electromagnetic force rules objects with excess charge (like electrons, protons, and socks shuffling over a fuzzy carpet), and gravity steers objects with mass. The first three forces largely ...

Gravity is the force that attracts two objects with mass towards each other. It is one of the most familiar forces in our daily lives, responsible for keeping us on the ground and the planets in orbit ...

According to the theory of general relativity, a galaxy must have a certain amount of mass to be held together by gravity.

Let's start with a definition. Gravity, or gravitational attraction, is the tendency of mass to gather toward itself, drifting together even across great distances due to curvature in spacetime.

Despite keeping us grounded and warping light that travels through space, gravity is actually quite a weak force. The smaller the mass, the less gravity appears to have any pull, until at quantum ...

Slowly these became the planets. Some newly formed planets had a large enough mass, and with it, a large gravitational force, to pull on and capture smaller objects that were moving past them. These ...

His idea: gravity can exist without any mass at all. The study explores a different solution to the same equations that normally describe gravity—both in Newtonian theory and in general relativity.