CAPE CANAVERAL, Fla. — NASA on Monday began the final countdown for Artemis II, the first crewed mission to the moon in more than half a century, with the massive Space Launch System rocket and Orion spacecraft poised for liftoff as early as Wednesday evening from Kennedy Space Center.

Artemis II Crew
Artemis II Crew NASA

The countdown clock started ticking at 4:44 p.m. EDT on March 30, targeting a launch at 6:24 p.m. EDT on April 1 within a two-hour window that extends to 8:24 p.m. The 32-story SLS rocket, the most powerful ever built by NASA, will propel four astronauts on a roughly 10-day journey that will take them around the moon and farther from Earth than any humans have traveled before.

This mission marks a pivotal moment in NASA's Artemis program, the agency's ambitious effort to return humans to the lunar surface and establish a long-term presence there as a stepping stone to Mars. It has been 53 years since Apollo 17 astronauts Eugene Cernan and Harrison Schmitt left the moon's surface in December 1972, closing the Apollo era.

The diverse Artemis II crew includes NASA astronauts Reid Wiseman (commander), Victor Glover (pilot), and Christina Koch, along with Canadian Space Agency astronaut Jeremy Hansen. Koch will become the first woman and Glover the first person of color to travel beyond low Earth orbit on a lunar mission. Hansen will be the first Canadian and non-American to venture into deep space.

"Artemis II is not just about going back — it's about going forward with a new generation of explorers and international partners," NASA Administrator said in recent remarks, emphasizing the mission's role in testing systems for future lunar landings targeted as early as 2028.

The uncrewed Artemis I test flight in 2022 successfully demonstrated the SLS and Orion's capabilities, traveling more than 1.4 million miles over 25 days. Artemis II will build on that success by carrying humans, validating life support systems, communication, navigation and the heat shield that will protect the crew during high-speed re-entry into Earth's atmosphere.

Mission managers reported no major technical issues during Monday's L-2 countdown status briefing. Weather forecasts for launch day showed an 80% chance of favorable conditions, though managers will monitor for any last-minute concerns such as upper-level winds or cumulus clouds.

The journey will take the crew on a free-return trajectory around the moon, passing approximately 4,000 miles above the lunar surface at its closest approach. During the flyby, expected around April 6 if launch occurs on April 1, astronauts will conduct observations, test Orion's systems and capture high-resolution imagery of the lunar far side. The mission is projected to set a new record for the farthest distance humans have traveled from Earth, surpassing the Apollo 13 record of about 248,655 miles.

Splashdown is targeted for April 10 or 11 in the Pacific Ocean off California's coast. The crew will then undergo medical evaluations and debriefings as NASA prepares for Artemis III, which aims to land astronauts — including the first woman and first person of color — near the lunar south pole.

The Artemis program has faced delays and cost overruns, with the total estimated expense since 2012 exceeding $93 billion. Technical challenges, including helium leaks and pressurization issues that scrubbed an earlier February attempt, pushed the launch from late 2025 into 2026. The rocket was rolled back to the pad on March 20 after repairs.

Despite the hurdles, officials expressed confidence. "We are ready," launch director Charlie Blackwell-Thompson said during recent briefings, praising the team's meticulous preparations across multiple NASA centers and contractor partners including Boeing, Lockheed Martin and Northrop Grumman.

Public interest has surged as the historic flight approaches. NASA plans extensive live coverage across its platforms, including NASA+, YouTube and traditional television networks. The agency encouraged viewers to follow along as the countdown progresses through critical milestones such as propellant loading, which begins early on launch day.

International partners have played key roles. Canada contributed the advanced Canadarm3 robotic system for future lunar gateway operations, while the European Space Agency supplied the Orion service module that provides propulsion, power and thermal control.

The mission also carries scientific and symbolic weight. Astronauts will test new spacesuits, radiation monitoring equipment and procedures that will support sustained human presence on and around the moon. Educational outreach programs aim to inspire a new generation of scientists and engineers.

For the crew, the flight represents the culmination of years of training. Wiseman, Glover and Koch have extensive spaceflight experience from International Space Station missions, while Hansen brings fighter pilot expertise. The quartet has trained together for the unique challenges of deep space, including simulated emergencies and lunar flyby scenarios.

As the countdown clock continues its steady descent, anticipation builds at Kennedy Space Center. Crowds are expected to line the Florida coast, with viewing areas in Titusville, Cocoa Beach and along the Banana River offering prime vantage points for the SLS liftoff's thunderous roar and brilliant flame.

NASA has urged the public to plan ahead for traffic and follow official safety guidance. Online resources provide real-time updates, launch webcasts and educational materials about the Artemis program's goals.

Beyond Artemis II, the program envisions a sustainable lunar economy, including a lunar Gateway station in orbit and regular crewed landings. These efforts position the United States and its partners to compete in a new space race, with China planning its own crewed lunar missions in the coming years.

For now, all eyes remain on the final hours of preparation. If weather and systems cooperate, the April 1 launch will ignite a new chapter in human exploration — one that aims to keep humanity's footsteps on the moon permanent rather than fleeting.

Engineers, technicians and flight controllers will work around the clock in the coming days, performing final checks on everything from ground support equipment to the Orion capsule's heat shield tiles. The astronauts, currently in pre-launch quarantine, will make their traditional walkout to the pad hours before liftoff, waving to well-wishers as they board the spacecraft.

As one NASA official noted during Monday's briefing, "We haven't heard words like 'go for translunar injection' since 1972. This week, we will."

The successful execution of Artemis II would clear the path for increasingly complex missions, ultimately fulfilling the Artemis program's promise of returning humans to the lunar surface and expanding humanity's reach into the solar system.

With the countdown underway, the world watches as NASA stands on the threshold of a new era of lunar exploration — 53 years in the making.