Einstein’s theory of special relativity tells us that for a moving object, time passes more slowly than for a stationary ...

A swarm of galaxies called the Bullet Cluster is the biggest, best natural laboratory for studying dark matter that ...

It’s the most significant leap forward in the study of black holes in decades, and proved a theory conceived by one of ...

For astronomers studying dark matter, the Bullet Cluster is one of the greatest laboratories in the universe. Follow-up ...