Gravity is something every person on Earth intuitively understands: It is what keeps you on the ground. But how come gravity pulls down, rather than pushes up? Einstein came up with the answer.

If humanity wants to travel between stars, people are going to need to travel faster than light. New research suggests that it might be possible to build warp drives and beat the galactic speed limit.

Field theory describes the universe as energy flowing along unending lines. With this perspective, it is possible to define a new fundamental building block of matter.

Researchers say Einstein's ideas hold up in a new kind of test. "This is a brand new way to test general relativity using supermassive black holes."

Quantum cosmology takes us "beyond the continuum described by general relativity where Einstein's physics breaks down—for example beyond the Big Bang."

So little is known about black holes and the image hints at a path to a higher-resolution image and more and better data.

A historian explains how war and politics almost overshadowed Albert Einstein's work and why Veterans Day should remind us of the threat of nationalism.

If wormholes, bridges between regions in spacetime, are more than just a sci-fi fantasy, researchers may have a way to detect them.