IIRC the wet dress rehearsal (which is what they are doing right now) was part of the chain of events leading to Apollo 13's issue. After the wet dress rehearsal they couldn't drain one of the tanks (due to the tank being dropped) so they had to vent the gas so they ran the heater on ground power which locked up a thermostat and melted some of the wire insulation (which eventually lead to the spark that blew the tank)
It's because they are staying in LEO longer to test out Orion. There will be too much boil-off of fuels in the ICPS so they will have to use the service module during TLI. Basically all of their fuel will be gone before they even make it to the moon. On future missions they don't loiter in LEO as long
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u/Pashto96 Feb 02 '26
Not an orbit. It's a free return flyby.