SpaceX's next test flight of its Starship megarocket Sunday could mark a world first: catching the returning first-stage booster using the launch tower's "chopstick" arms -- a crucial step in the company's quest for rapid reusability. The launch window opens at 7:00 am (1200 GMT) from the company's Starbase in Boca Chica, Texas. A live webcast will be carried on SpaceX's website and its X account. The company tweeted early Sunday that conditions appeared favorable for an on-time launch.