Friday in D.C. occupied a special spot between May Day and Derby Day, and seemed to rise to the atmospheric occasion. It ...

At these heights, the atmosphere is cold enough that clouds are typically composed of ice crystals, not water droplets. These clouds often look thin, wispy, and delicate—but they can provide valuable ...

At 300 light-years away, the interstellar cloud is the closest of its kind ever found to Earth and the largest apparent single structure in the sky.

NASA's SPHEREx space observatory has spent the last six weeks undergoing checkouts, calibrations, and other activities to ...