A colossal structure in the distant Universe is defying our understanding of how the Universe evolved. In light that has traveled for 6.9 billion years to reach us, astronomers have found a giant ...

The big galaxy at the core of the cluster Abell 2261 should harbor a supermassive black hole that weighs as much as 3 billion to 100 billion suns. But astronomers can't find it.

Astronomers at the University of Hawaii uncovered black hole events so packed with energy, they were the biggest explosions ...

Astronomers have detected an enormous γ-ray bubble that could be a source of the Milky Way’s most powerful cosmic rays — high-energy particles that rain down on Earth from space. The ...

Beijing is celebrating its successful world-first mission to collect samples from the far side of the moon, saying U.S. efforts to deter China can’t keep it from making “giant steps” in space.

A group of Israeli scientists wants to send a giant sail into space to block a portion of solar radiation. The shade in this artist’s rendering is enhanced to illustrate the concept.