The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the ...

Day and night will get equal time for a brief moment Monday as much of the world heads into fall. The autumnal equinox marks ...

Roughly every 378 days, Saturn swings into opposition, appearing up to 30% brighter and staying visible from dusk until dawn. The night sky is full of quiet wonders, but once a year Saturn steps into ...

Earth has a number of mini-moons and quasi-moons. Mini-moons are objects that orbit our planet. But they make for fickle fans: They tend to swing around Earth for only a matter of months. One example ...

An exclusive look at a Space Force training exercise offered rare insights into how the secretive branch is preparing to ...

Fall is coming to Arizona as the autumnal equinox arrives on September 22, 2025. The equinox brings nearly equal day and ...