HOUSTON - Four Artemis astronauts were zooming towards the Moon on Thursday after a major engine firing, a milestone that commits NASA to the first crewed lunar flyby in more than half a century.
With enough thrust to accelerate a stationary car to highway driving speed in less than three seconds, the Orion capsule engine blasted the astronauts on their trajectory towards the Moon, which they now will loop as part of the 10-day Artemis 2 mission.
"Human beings have left Earth orbit" for the first time since 1972, said NASA official Lori Glaze at a briefing in Houston following the nearly six-minute burn.
In the moments that followed what the US space agency dubbed a "flawless" firing, astronaut Jeremy Hansen said that "humanity has once again shown what we are capable of."
Later on the astronauts said they were "glued to the window" taking pictures.
"We are getting just a beautiful view of the dark side of the Earth right now, lit by the Moon," said Hansen. "Phenomenal."
Thursday's burn, the last major ignition of the mission, came one day after the enormous orange-and-white Space Launch System (SLS) rocket carrying the Orion capsule launched from Kennedy Space Center in Florida for the long-anticipated journey around the Moon.
Now that they're Moonbound, there's no turning back: The astronauts are on a "free-return" trajectory, which uses the Moon's gravity to slingshot around it before heading back towards Earth without propulsion.
"From this point forward, the laws of orbital mechanics are going to carry our crew to the Moon, around the far side and back to Earth," said Glaze.
The astronauts are wearing suits that also serve as "survival systems" -- in the unlikely case of a cabin depressurization or leak, they'll maintain oxygen, temperature controls and the correct pressure for up to six days.
The astronauts -- Americans Reid Wiseman, Victor Glover and Christina Koch along with Canadian Hansen -- spent their first hours in space performing checks and troubleshooting minor problems on the spacecraft that has never carried humans before, including a communications issue and a malfunctioning toilet.
Howard Hu, who oversees the Orion spacecraft, said during Thursday's briefing that the team had accomplished the objectives of tests designed to demonstrate the capsule's ability to dock with a future lunar lander.
The crew did "a terrific job," Hu said.
"I'm just really happy that we're headed to the Moon," he added.
NASA Orion program manager Howard Hu (R) and acting associate administrator for NASA’s Exploration Systems Development Mission Directorate Lori Glaze (L) listen to NASA flight director Judd Frieling (C) speak during a status briefing of the Artemis II crewed lunar mission at Johnson Space Centre in Houston, Texas, on April 2, 2026.