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).

NASA astronauts Nick Hague and Drew Morgan completed a 6-hour, 32-minute spacewalk outside the International Space Station Wednesday to help connect a newly-arrived docking port to the orbiting research outpost.

These photos show the 215-foot-tall Falcon 9 rocket and Crew Dragon spacecraft at launch pad 39A, ready for liftoff from Florida’s Space Coast on a critical test flight to the International Space Station.