You can watch the fueling test live on NASA's website.
Artemis 1's Space Launch System (SLS) megarocket will be loaded with liquid hydrogen and liquid oxygen propellants this morning. The sun rises and sets at 1115GMT. You can watch it here at Space.com or via NASA.
The SLS will be used to launch an uncrewed journey to the moon and back from NASA's Kennedy Space Center. The test flight was supposed to lift off late last month but was delayed twice by problems, the first of which was a liquid hydrogen leak in the lead up to the liftoff.
Related: NASA's Artemis 1 moon mission: Live updates
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Two seals at the site of the leak were replaced by the Artemis 1 team. The test today will determine if that fix worked. There will be a backup opportunity on October 2 if everything goes well.
NASA said in an update on Friday that it will conclude when the objectives for the test have been met.
There are other spaceflight actions on tap for today. The International Space Station is expected to be reached by a Russian rocket at 9:54 a.m. on Thursday. The sun rises at 1354GMT. When the time arrives, you can watch that here at Space.com.
The goal of NASA's Artemis program is to establish a long-term human presence on and around the moon by 2020. If Artemis 1 goes well, Artemis 2 will launch astronauts on a trip around the moon in 2024 and Artemis 3 will land people near the moon's south pole in two years.
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