NASA’s first crewed moon mission in decades was delayed as its engineers grapple with an all-too-familiar rocket problem: hydrogen leaks. Fixing the issue is even trickier than it may seem.

The four Crew-12 astronauts brought the International Space Station’s staff back to seven after a month of operating with three people on board.

Sign up for CNN Science’s pop-up newsletter covering NASA’s Artemis II mission, which will take four astronauts on a 10-day ...

NASA’s rehearsal for Artemis II marks one of the final steps before four astronauts get launched into deep space for the first time since the Apollo program ended.

Humans haven’t been back to the moon since the Apollo moons program ended over five decade ago. The reasons why go beyond science, according to experts.

(CNN) — NASA is now targeting March for the earliest possible launch of its historic Artemis II lunar moon mission, which will send four astronauts into deep space for the first time since the Apollo ...