Video: Falcon 9 stands at the launch pad

United Launch Alliance called off a test-firing of the company’s first flight-rated Vulcan Centaur rocket at Cape Canaveral Thursday to troubleshoot a problem with the booster’s engine ignition system.

A United Launch Alliance Delta 4-Heavy rocket climbed into space Sunday with NASA’s Parker Solar Probe on a daring mission to explore the atmosphere of the sun. Liftoff from Cape Canaveral occurred at 3:31 a.m. EDT (0731 GMT).

Information found in federal regulatory filings suggests SpaceX plans to conduct a Falcon 9 rocket launch as soon as mid-November with an unidentified payload that has so far escaped public disclosure.