SpaceX conducts engine test fire for communications satellite launch (members only)

SpaceX’s Falcon 9 rocket got within a second of liftoff Sunday before a low-thrust alarm triggered an automatic abort. Watch a view of the dramatic last-second countdown cutoff at engine ignition from our camera at the launch pad.

The mission comes on the heels of SpaceX having to stand down from launching the Polaris Dawn astronaut mission due to weather concerns. The lost booster, tail number B1062, was aiming for a record 23rd landing on the droneship ‘A Shortfall of Gravitas’ when it collapsed and exploded.

SpaceX launched a Falcon 9 rocket at 8:51 a.m. EST (1351 GMT) Sunday from Cape Canaveral with the first in a new line of upgraded U.S. Air Force GPS navigation satellites. The launch was delayed five days due to technical and weather concerns.