Launch of the Curiosity Mars rover

United Launch Alliance called off the planned launch of an Atlas 5 rocket Wednesday at Cape Canaveral to resolve a problem with valves at the launch pad, while a SpaceX team a mile-and-a-half to the south readied a Falcon 9 rocket for liftoff Thursday evening with a GPS navigation satellite for the U.S. military.

Former Johnson Space Center Director Christopher Columbus Kraft Jr., the man who created the iconic role of NASA flight director during the Mercury and Gemini programs and whose no-nonsense, uncompromising management style defined control room operations and discipline through the Apollo years and beyond, died Monday. He was 95.

SpaceX has launched its fourth Falcon 9 rocket from Florida’s Space Coast in less than 16 days. A Falcon 9 rocket blasted off with 60 more Starlink internet satellites at 2:42 a.m. EDT (0642 GMT) Sunday. The reusable booster, making its 10th flight, landed on a drone ship parked in the Atlantic Ocean.