This video explains how scientists estimate the size of the observable universe, what “radius” means in cosmology, and why ...

The accelerating expansion of the universe is usually explained by an invisible force known as dark energy. But a new study ...

Astronomers have discovered that a young galaxy was gradually starved by its central supermassive black hole, in what was ...

Researchers have proposed a theoretical timepiece, dubbed the "CRASH Clock," which tells us how quickly satellites would ...

Astronomers have spotted one of the oldest "dead" galaxies yet identified, and found that a growing supermassive black hole ...