Q&A with Keith Gendreau, principal investigator of the first X-ray space communications experiment (members only)

SpaceX called off a launch attempt in Texas Monday for the Super Heavy booster and Starship launch vehicle, blaming a bad valve on the first stage. The next launch attempt for the world’s largest rocket is scheduled for Thursday, depending on weather and a fix for the valve problem.

Vaulting into a starry sky over Florida’s Space Coast, a SpaceX Falcon 9 rocket successfully took off early Sunday with a Japanese video and data relay satellite, then stuck a landing on a barge stationed nearly 400 miles east of Cape Canaveral.

SpaceX has concluded fatigue on an engine cover caused one of the nine Merlin 1D first stage engines on the company’s most recent launch to shut down early during ascent, leading to the loss of the booster during an offshore landing attempt in the Atlantic Ocean, an official said Monday.