Nuclear weapons haven’t been tested in the United States since 1992. Find out why, and what could happen if the hiatus ends.

Boulder, Colo. — A laboratory method developed for making and analyzing cold, concentrated samples of a mysterious “floppy” molecule thought to be abundant only in outer space has revealed new data ...

Southwest Research Institute (SwRI) scientists conducted lab experiments to address a mystery about the origins of frozen hydrogen peroxide (H 2 O 2) on Jupiter's icy moon Europa. Their results, ...

The Polaris Dawn crew Jared Isaacman, Scott "Kidd" Poteet, Sarah Gillis and Anna Menon explain the experiments conducted during the mission. Also, see a time-lapse of Isaacman's spacewalk. Credit: ...