Photos: Spectacular start to Delta 4-Heavy’s satellite deployment mission

The launch of a European Ariane 5 rocket was aborted moments after its main engine ignited Tuesday. The dramatic last-second hold was the first time an Ariane rocket launch was aborted after engine start since March 2011. Arianespace has not set a new target launch date for the mission, which will loft two U.S.-built communications satellites for Intelsat and B-SAT.

Hobbyists who keep track of the skies with remarkable precision have found the U.S. Air Force’s mini space shuttle in its no-longer-secret orbit around the Earth.

The 330-foot tall mobile service tower is rolled away from the United Launch Alliance Delta 4 rocket at Cape Canaveral’s pad 37B in the hours before the scheduled liftoff on Aug. 19.