Live coverage: Two satellites lift off aboard Ariane 5

A modified Russian missile built for nuclear war blasted off on a peaceful mission Friday, targeting placement of a European Earth observation satellite in orbit to measure atmospheric chemistry and global air quality. Liftoff from the Plesetsk Cosmodrome in northern Russia occurred at 0927 GMT (5:27 a.m. EDT).

Blaming a slew of technical snags and “avoidable errors,” NASA officials said Tuesday that the launch of the James Webb Space Telescope, already years behind schedule, will be delayed to 2020, potentially pushing the mission’s development cost above an $8 billion cap mandated by Congress.

SpaceX announced Monday two new Falcon 9 and Falcon Heavy rocket missions from Cape Canaveral, Arianespace said it cinched a contract to launch a Japanese TV broadcasting satellite, and International Launch Services revealed a deal to launch a Spanish telecommunications payload, ending a drought in commercial Proton launch orders.