Nuclear power plants are safer than many suspect. But putting reactors in space is a concept with a checkered history. One ...

Long before the full moon rises, shifting sunlight transforms the lunar surface into one of the sky's best telescope targets.

This goes against the previous theory, which has long suggested that Nereid is actually an object captured from the Kuiper ...

KENNEDY SPACE CENTER — The Artemis II crew performed a special burn of the Orion capsule on Thursday evening. This critical burn is the last step to sending the four astronauts on a flyby of the moon.

Neptune's mysterious, far-flung moon Nereid may be the last of the planet's original companions. Scientists at the California ...