The countdown clock is officially rolling at Kennedy Space Center in Florida for NASA to return humans to deep space for the first time in 50 years.

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 ...

A look at NASA's iconic countdown clock For decades, the world-famous NASA countdown clock has told the world when to hold its breath. The Artemis II launch attempt is set for Wednesday, April 1.