Physicists have finally done what once sounded like science fiction: they have read the X-ray “fingerprint” of a single atom, isolating the signal of one of nature’s smallest building blocks from the ...

Meteors from the Ursids appear near the Little Dipper, which is part of the constellation Ursa Minor. Only skywatchers in the Northern Hemisphere will have a chance of seeing this shower. The moon ...

The best time to hunt for Ursid meteors is from the evening of Dec. 21 straight through to dawn on Dec. 22. The shower's peak ...

This mash-up of data from the James Webb Space Telescope and the Chandra X-ray Observatory reveals two galaxies mid-collision, with their spiral arms overlapping and bending toward their neighbors' ...

Mars at sunset reveals dozens of razor-thin atmospheric layers in stunning detail, helping scientists map dust and ice ...