Live coverage: Launch of Delta 4-Heavy aborted seconds before liftoff

An International Launch Services Proton rocket lifted off at 2137 GMT (4:37 p.m. EST) on Dec. 27 with the Astra 2G communications satellite, a new broadcasting platform owned by SES to beam television and broadband services to Europe, Africa and the Middle East.

United Launch Alliance is set to retire part of its rocket family Thursday with the final flight of the Delta 4 rocket’s “single stick” configuration, a mission set for liftoff from Cape Canaveral carrying a new GPS navigation satellite into orbit for the U.S. Air Force.

Freed from a legal restriction officials said limited its ability to compete for future U.S. military satellite launches, United Launch Alliance has ordered 20 new RD-180 engines from Russia that will keep the Atlas 5 rocket flying into the early 2020s.