Around 13.7 billion years ago, something collapsed. It fell outward into the nothingness that stretched in every direction, ...

A galaxy in the distance, was tightly encircled by a halo of light—also known as an Einstein Ring, a result of gravitational ...

Star Wars destroyed one of the most powerful Sith artifacts in its established universe. History of that artifact & how it ...

This puzzling result makes sense if one assumes that the boundary stars are feeling the gravitational effects of an unseen mass—dark matter—in a halo around the galaxy. Dark matter could also ...

This was the birth of our modern universe of galaxies, so poetically celebrated in Seeing in the Dark. Today, astronomers have measured the distance to the Andromeda Galaxy much more precisely ...