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

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

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

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

Scientists are using cosmic distortions in light to test a bold idea: that the Universe might not be as symmetrical as we’ve ...

"We think that, once we go further away from the galaxy, we recover all of the missing ... changes in the light behind it – the cosmic microwave background, the fossilized 'first light' in the ...

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

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

"We've always known that we need something to complete the puzzle, but we haven't really known what shape or form those missing pieces were going to be." ...

Mysterious dark matter makes up 85 percent of matter in the universe, and of the remaining 15 percent, scientists couldn’t ...

The galaxy images used—all luminous ... the effect of dark energy on the expansion of the universe. Measurements of the cosmic microwave background (CMB) around these galaxies were made by ...

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