General relativity

When you emit gravitational waves, they have to pass through the Universe. But do they gravitate, too?

Astronomy notes by Nick Strobel for an introductory astronomy course.

Albert Einstein's theory of relativity is the basis for our understanding of the universe, but if you still aren't quite sure how it works, this video does an excellent job of explaining.

STRETCHING SPACETIME According to general relativity, the sun’s mass makes an imprint on the fabric of spacetime that keeps the planets in orbit. A neutron star leaves a greater mark. But a black hole is so dense that it creates a pit deep enough to preve

According to Albert Einstein’s general theory of relativity, gravity is no longer a force that acts on massive bodies, as viewed by Isaac Newton’s universal gravitation. Instead, general relativity links gravity to the geometry of spacetime itself, and particularly to its curvature. Learn more at the link!

The Physics of the Universe - Special and General Relativity - General Theory of Relativity

Parsing Albert Einstein's theory of our universe -- an idea that's utterly mind-bending, yet seemingly shatterproof.

DOES ANYONE KNOW THE ANSWER??

SPECIAL VS GENERAL relativity . . . gee, I never CAN keep these two straight!

The speed of gravity is taken to be exactly equal to the speed of light. But is that necessarily true? Here's how we know.