Atlas 5 launches NROL-61 as seen from the NASA Press Site

Spaceflight Now’s readers sent in photos from Thursday night’s launch of four NASA satellites aboard an Atlas 5 rocket, marking a fiery start to a mission probing the fundamental workings of the magnetic bubble shielding Earth from cosmic radiation.

Mission leaders Tuesday gave approval for rollout of the United Launch Alliance Atlas 5 rocket on Wednesday morning, leading to liftoff Thursday night of the Magnetospheric Multiscale science project for NASA.

The 81st flight of a United Launch Alliance Atlas 5 rocket, set for liftoff Friday from Cape Canaveral, will come with its share of firsts when it sends Boeing’s Starliner crew capsule toward the International Space Station on an unpiloted test flight. The launcher will fly without a payload shroud, which typically envelopes satellites during liftoff, and it will debut an uprated dual-engine Centaur upper stage that will power the Starliner on a unique suborbital trajectory optimized for astronaut comfort.