The "afterglow" of the universe is an important piece of evidence for the Big Bang. This background radiation also provides ...

The word itself comes from galaktikós kyklos, or “milky circle,” the ancient Greek term for the Milky Way, our home galaxy.

Astronomers have long sought to understand where half of the ordinary matter in the Universe is hiding. Half of the 15% of ...

The most recent measurement of a nearby galaxy cluster is deepening a disagreement about how fast the universe is expanding — ...

Using data from space telescopes and other instruments, astronomers, cosmologists, and astrophysicists are able to deduce and ...

Scientists have found evidence for a cosmic collision in the Perseus cluster, a group of thousands of galaxies not far from ...

Did you know some of the brightest sources of light in the sky come from the regions around black holes in the centers of ...

If you ever want to get a bit of perspective, there's very little that's more humbling than a good deep field image – and ...

Astronomers may have found the long-missing half of the universe's regular matter—and it appears to have been right under our noses all this time. Models of how the universe has evolved since the Big ...

Researchers suggest the universe's background radiation has been overestimated, potentially challenging the standard model of ...