A launch countdown includes “L Minus” to indicate how far away liftoff is in hours and minutes, and “T Minus” to show a sequence of events built into the launch countdown.

The Artemis II mission countdown timeline ahead of launch from Kennedy Space Center’s Launch Pad 39-B and the planned mission timeline for its 10-day flight that will venture past the moon and return to Earth with a splashdown in

NASA officials on Monday started the two-day countdown to the Artemis II mission launch, which will send a crew of four around the moon.

Forecasters continue to predict an 80% chance of favorable weather on Wednesday for the launch of four astronauts on a flight to the moon.

Explore the detailed sequence of NASA’s Artemis II launch countdown, including planned holds, tanking procedures, and terminal countdown events before liftoff.

NASA teams across the country have begun the launch countdown for the Artemis II mission around the moon. Here are some of the key milestones that takes place started at L-16 hours.

Countdown clocks began ticking Monday, setting the stage for launch of the Artemis II moon mission early Wednesday evening.

Launch preparations have begun for the Artemis II mission, NASA’s planned lunar fly-around by four astronauts that will be the first moon trip in 53 years.

NASA's Artemis II mission is returning to Earth this week. "To be a tiny speck on this mission they're on is beyond crazy," said Young & Sick, whose cover of Passion Pit's "Sleepyhead" was among the music selected by the crew. The crew is expected to see parts of the moon no other humans have ever seen.

The countdown to launch of the Artemis II crew's flight around the moon begins Monday at the Kennedy Space Center in Florida.