Nasa is getting ready to send Artemis-1 into space. This will be the first step in the space agency's plan to go back to the Moon.
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The first test is going around the Moon without a crew. But it will be a big test not only of the Space Launch System, which will one day carry people
When the first launch window opens on Monday, August 29, it will all start. The first launch window will open at 8.33am local eastern time, which is 1.33pm in the UK.
Nasa will have 120 minutes to fire up the rocket and send it into space. If it doesn't make that window, the launch will have to be put off.
But if it misses that one, it has a second chance on September 2 and September 5.
NASA will probably use the first slot.
sensors will be put on mannequins that will ride on the spacecraft and measure things like radiation and vibrations.
The spacecraft will go 40,000 miles past the far side of the moon and stay in space longer without docking to a space station than any other spacecraft ever has.
It will be in space for 42 days, and some of that time will be spent going around the Moon. In October, the capsule is expected to land in the Pacific Ocean.
NASA says that this mission, called Artemis I, is the first in a series of increasingly complicated missions that will build a permanent human presence on the Moon.