Posted: Fri, Apr 14, 2023, 9:36 PM ET (0136 GMT)
A May launch of the first Vulcan Centaur is in doubt after an incident during a test of another Centaur upper stage. United Launch Alliance said that a Centaur structural article suffered an "anomaly" during a March 29 test at the Marshall Space Flight Center. A leaked image showed a fireball erupting from the test stand from liquid hydrogen that had been loaded into the Centaur for the test. ULA CEO Tory Bruno said late Friday that the test article is still "largely intact" and that would aid in the investigation. The incident, though, has raised doubts about the schedule for the first Vulcan launch, currently set for no earlier than May 4.

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•  Ars Technica article