Add Yahoo as a preferred source to see more of our stories on Google. The countdown clock for a Wednesday launch attempt of NASA’s Artemis II mission began ticking at 4:44 p.m. Monday at Kennedy Space ...

NASA ran into exasperating fuel leaks during a make-or-break test of its new moon rocket Monday, calling into question how soon astronauts could take off for a trip around the moon.The leaks — ...

NASA and contractor engineers pumped more than 750,000 gallons of supercold propellants into the agency's huge Space Launch System rocket Thursday without any signs of hydrogen leaks in a major step ...

NASA started the countdown clock for Artemis II while SpaceX lined up another launch with a record-setting booster.

NASA cleared engineers to load more than 750,000 gallons of supercold propellants into the agency’s huge Space Launch System rocket Thursday in a second “wet dress rehearsal” countdown to verify leak ...