universe

Short answer: We don't really know how the universe was created, though most astrophysicists believe it started with the Big Bang.

Astronomers have created a colorful interactive map of more than 200,000 galaxies and quasars spanning the lifespan of the cosmos.

Albert Einstein’s theory of general relativity has been remarkably successful in describing the gravity of stars and planets, but it doesn’t seem to apply perfectly on all scales.

The universe is about 13.8 billion years old, but how do we know that?

Do astronomers know which star is the oldest and which is the youngest in the universe? How can they tell?

Could alien life be hiding in the multiverse? New studies say, "sure!"

An astronomer uses gamma ray bursts to shine a light on outer space.

The big stars make our sun look puny.

Two entirely different ways of "weighing" the cosmos are producing disparate results. The discrepancy could be a sign that physicists will need to revise the standard model of cosmology.

Dark energy could be caused by pressure from giant voids of nothingness that may be flinging the universe apart.