A new study casts doubt on the universe’s accelerating expansion, suggesting dark energy might be weakening over time.

In 2005, scientists announced that moss could grow inside of spaceships. The little plants the scientists sent up on NASA ...

In 1887, one of the most important experiments in the history of physics took place. American scientists Michelson and Morley ...

The universe is supposed to look the same no matter where you stand. That idea, known as the cosmological principle, sits at ...

Searching for life on other planets requires more than just measuring their distances from their stars. A future NASA ...

Our solar system is speeding through the galaxy at more than three times the velocity scientists once believed, according to ...

Astronomers say they spotted signs of a giant explosion releasing from a star beyond our solar system, one powerful enough to destroy a planet’s atmosphere.

Hypersonic flight could one day make long-haul travel as quick as a short movie. Researchers are testing how turbulence ...