NASA scrubs first SLS launch attempt due to engine issue [Updated]
Enlarge / NASA's Space Launch System, reflected in the turn basin at the Kenendy Space Center in Florida. (credit: Trevor Mahlmann)
8:40am ET Update: NASA has called a scrub on its first attempt to launch the Space Launch System rocket. The problem was due to an "engine bleed" issue, which effectively means that one of the four main engines could not be properly chilled ahead of its ignition.
It is not clear when the next launch attempt will occur. NASA has an availability to launch at 12:48 pm ET (16:48 UTC) on September 2. However, if work is needed on one of the engines, the rocket likely would need to be rolled back to the Vehicle Assembly Building, pushing back a launch attempt until at least October.
Ars will have full coverage of the scrub, and what happens next, later on Monday afternoon.