NASA's Orion capsule has passed within almost 130km of the moon in the final big stage ahead of its record-breaking lunar orbit.
The close approach occurred as the crew capsule and its three test dummies passed on the far side of the moon during a slingshot manoeuvre.
Because of a half-hour communication blackout, flight controllers in Houston did not know if the critical engine firing went well until the capsule emerged from behind the moon, more than 373,367km from Earth.
It is the first time a capsule has visited the moon since NASA's Apollo programme 50 years ago, and represented a huge milestone in the $4.1 billion test flight that began last Wednesday.
Orion's flight path took it over the landing sites of Apollo 11, 12 and 14 - humanity’s first three lunar touchdowns.
The moon loomed ever larger in the video beamed back earlier in the morning, as the capsule closed the final few thousand kilometres since blasting off last Wednesday from Florida's Kennedy Space Center, atop the most powerful rocket ever built by NASA.
"This is one of those days that you’ve been thinking about and talking about for a long, long time," flight director Zeb Scoville said while awaiting to resume contact.
As the capsule swung out from behind the moon, onboard cameras sent back a picture of Earth - a blue dot surrounded by blackness
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Orion needed to undertake a slingshot move around the moon in order to pick up enough speed to enter the sweeping, lop-sided lunar orbit.
If all continues to go well, another engine firing will place the capsule in that orbit on Friday.
Next weekend, Orion will shatter NASA's distance record for a spacecraft designed for astronauts – nearly 402,336km from Earth, set by Apollo 13 in 1970.
And it will keep going, reaching a maximum distance from Earth next Monday at nearly 434,522km.
The capsule will spend close to a week in lunar orbit, before heading home. A Pacific splashdown is planned for 11 December.
Mission Time: 5 days, 7 hrs, 51 min— Orion Spacecraft (@NASA_Orion) November 21, 2022
Orion is 225,285 miles from Earth, 3,734 miles from the Moon, cruising at 4,209 miles per hour.
P: (-202014, -101427, -38151)
V: (3656, -1722, -1175)
O: 54º, 62.8º, 23.2º
What's this? https://t.co/voR4yGy2mg #TrackArtemis pic.twitter.com/efrXyNGViq
Orion has no lunar lander. A touchdown will not arrive until NASA astronauts attempt a lunar landing in 2025 with SpaceX’s Starship. Before then, however, astronauts will strap into Orion for a ride around the moon as early as 2024.
NASA managers were delighted with the progress of the mission. The Space Launch System rocket performed exceedingly well in its debut, they told reporters late last week.
The 98.14m rocket caused more damage than expected, however, at the Kennedy Space Center launch pad.
The force from the lift-off thrust was so great that it tore off the blast doors off the lift.