These are the cosmic voids.The smallest voids are about 20 million light-years across on a side, and the largest ones go for hundreds of millions of light-years.

Cosmic rays—high-energy particles moving close to the speed of light—originated from somewhere in the Milky Way galaxy and beyond, but exactly where has been a mystery since they were ...

A cosmic enigma Now, researchers are trying to figure out the source of ASKAP J1832-0911’s radio waves and X-rays, which don’t fit into a neat box for categorization, and whether it’s truly ...

Findings from a new study into the cosmic "afterglow" may rewrite the history of the universe, according to researchers. This afterglow—the "cosmic microwave background" (CMB), the relic ...

In the cosmic joust, new reserves of fuel are brought within reach of the black hole powering the quasar. As the black hole feeds, the quasar can continue its damaging attack.