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SpaceX is about to attempt its most ambitious Starship test flight yet. Here's what to know

Liftoff of the Super Heavy rocket booster, topped with the uncrewed Starship spacecraft, is expected to occur during a 30-minute launch window that opened at 8 a.m. ET from SpaceX's Starbase facility in Boca Chica, Texas. SpaceX said in a Sunday morning update it was targeting liftoff at 8:25 a.m. ET (7:25 a.m. CT).