NASA came within 20 seconds of completing a countdown rehearsal of the SLS June 20 after hours of delays caused primarily by a hydrogen leak. Credit: NASA TV Updated 7:45 a.m. Eastern to correct the ...

NASA on Tuesday restarted a two-day dress rehearsal countdown for the agency's new Space Launch System moon rocket after a series of unrelated glitches, mostly involving ground systems, blocked two ...

Just days after Jared Isaacman took control as head of NASA and President Trump signed an executive order calling for a return to the moon by 2028, the four-person astronaut crew who will fly around ...

NASA’s Artemis II mission cleared its final major ground test on the evening of February 19, completing a wet dress rehearsal that loaded the Space Launch System (SLS) rocket with cryogenic ...

A computer controlling the Atlas V rocket’s countdown triggered an automatic hold less than four minutes prior to liftoff of Boeing’s commercial Starliner spacecraft Saturday, keeping the crew test ...

CAPE CANAVERAL, Fla. (AP) — NASA began another practice launch countdown Tuesday for its first moonshot in decades with astronauts after making repairs to fix dangerous fuel leaks that already have ...