A compound lens forged by two galaxies is helping astronomers get a bead on the Hubble Constant and dark energy.

The Arecibo Message as it appears when its 1,679 bits are properly aligned on a grid (left), an annotated illustration ...

The Full Super Moon occults the Pleiades, the ice giant Uranus reaches opposition, and the Leonid meteor shower peaks in the ...

New research sheds light on how a pair of unusual black holes may have been able to keep their companion stars alive — and at a distance.

A 3D map of our cosmic neighborhood has revealed hot and cold regions as well as an "escape tunnel" from our local bubble.

There is a region of the sky where astronomers fear to look. Filled with dark clouds of dust, it hides an unseen mass. A mass ...

Roughly 400,000 years after the Big Bang, the universe cooled just enough to allow photons to escape from the primordial ...

This process won't be complete for many millions of years — until then, Queen Berenice II will have to suffer the knots in ...