Marcia Dunn

The 322-foot Space Launch System rocket had spent a month at the pad ready for potential liftoff, but encountered a series of problems serious enough to require a return to...

Grounded until at least April, NASA’s giant moon rocket is headed back to the hangar this week for more repairs before astronauts climb aboard.

NASA’s new moon rocket suffered another setback Saturday, almost certain to bump astronauts’ first lunar trip in decades into spring.

The International Space Station returned to full strength with Saturday’s arrival of four new astronauts to replace colleagues who bailed early because of health concerns.

NASA began a two-day practice countdown Saturday leading up to the fueling of its new moon rocket, a crucial test that will determine when four astronauts blast off on a...

NASA’s giant new moon rocket headed to the launch pad Saturday in preparation for astronauts’ first lunar fly-around in more than half a century.

Discovered over the summer, the comet known as 3I/Atlas is only the third confirmed object to visit our corner of the cosmos from another star. It zipped harmlessly past Mars...