SpaceX postpones launch of “most powerful” rocket

SpaceX stopped a launch attempt for its Super Heavy rocket and Starship spacecraft in Boca Chica, Texas, on Monday. The 230-foot rocket has 33 engines and can generate 16.7 million pounds of thrust, the company said, making it the most powerful rocket ever built. Engineers planned for Starship to complete a partial orbit of Earth before crashing into the Pacific near Hawaii. The Federal Aviation Administration approved the test launch on Friday, but SpaceX CEO Elon Musk said the flight was canceled on Monday due to a valve problem. Musk...