For all its ancient, familiar features, the Moon is still changing—and sometimes in dramatic ways. Scientists recently identified a fresh 22-meter-wide crater by comparing orbital images taken years apart,

Artemis 2's Orion spacecraft is well-shielded, but its astronauts may still have to take protective measures if they encounter a radiation storm.

Earth has long been deemed safe from a calamitous collision with a certain small asteroid in 2032. The moon, on the other hand, remained under threat for a little while longer. Finally, though, scientists have been able to conclusively rule out a lunar ...