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Countdown clocks began ticking Saturday for the maiden launch of NASA new Space Launch System rocket Monday on a long-awaited mission to send an unpiloted Orion crew capsule around the moon and back.

The Orion crew module hatch was closed for launch Thursday morning after technicians at pad 39B completed final closeouts and outfitting inside the spacecraft before liftoff next week on the unpiloted Artemis 1 test flight around the moon.

The 10 CubeSats hitching a ride to deep space on NASA’s Space Launch System moon rocket promise new discoveries about the moon, space weather, and asteroids. But some of the small spacecraft will launch with their batteries only partially charged after sitting inside the rocket for more than a year.

European space officials have hailed the importance of NASA’s upcoming inaugural Artemis mission and the vital role ESA is playing in supporting a return to the moon.

NASA began the two-day launch countdown for the Artemis 1 lunar test flight at 10:23 a.m. EDT (1423 GMT) Saturday. Liftoff of the Space Launch System moon rocket remains set for Monday during a two-hour window opening at 8:33 a.m. EDT (1233 GMT).