Add Yahoo as a preferred source to see more of our stories on Google. For the first time in half a century, countdown clocks began ticking Monday toward launch of a three-man one-woman crew on a trip ...

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 Center. Minutes later, SpaceX knocked out its 21st launch of the year ...