The spacecraft burns hydrazine fuel mixed with an oxidizer, nitrogen tetroxide, to power its main engine and thrusters for in-space maneuvers. The leak on Artemis II is in the helium pressure supply to the oxidizer side.

The most dangerous part of the Artemis II astronauts' mission will happen when the Orion spacecraft returns to Earth and splashes down into the Pacific Ocean on Friday.

Orion's interior space is equivalent to that of two minivans, NASA says. That's a lot more breathing room than space capsules of the 1960s and '70s.

NASA’s Artemis II mission is set for reentry at near 24,000 mph with temperatures near 5,000 degrees Fahrenheit.

NASA’s Artemis II mission has yet to return to Earth—it will do so on Friday evening, splashing down into the Pacific Ocean off the coast of San Diego—but the agency is already nearing some key decisions on the next Artemis mission.

Brian Brill watched with a kind of restlessness as the Artemis II spacecraft left the launching pad on its 10-day journey around the Moon on April 1. A Pottsville native, Brill worked on the Orion capsule carrying four astronauts on

The dozens of photos taken by the astronauts include never before seen views of the moon, a total solar eclipse and a stunning shot of Earth.

NASA’s Orion crew shares detailed images of the moon, including new crater views, Earthrise, and a lunar eclipse during the Artemis mission.