South of Egypt, Nubia produced some of Africa’s most remarkable kingdoms.

Physicists propose that a mysterious force known as early dark energy could solve two of the biggest puzzles in cosmology and fill in some major gaps in our understanding of how the early universe ...

Most of the universe is missing. Only 5% of it is normal matter, which makes up all the people, planets and stars we can see; the other 95% consists of mysterious dark matter and dark energy.

Astronomers have been confounded by recent evidence that the universe expanded at different rates throughout its life. New findings risk turning the tension into a crisis, scientists say. When you ...