Live coverage: Two-man crew departs space station, returns home

A United Launch Alliance Atlas 5 rocket lifted off from Cape Canaveral today at 7:42 p.m. EST (0042 GMT) to deploy the U.S. military’s SBIRS GEO Flight 3 observatory, equipped with advanced telescopic infrared vision to spot enemy missile launches, for early warning surveillance.

NASA unveiled an ambitious program Friday to commercialize low-Earth orbit, making way for product development and even advertising aboard the International Space Station, month-long visits by company astronauts starting as early as next year and use of a station docking port for privately financed research-and-development modules.

In the final hours of a 340-day mission, Scott Kelly and Mikhail Kornienko said goodbye to their crewmates and closed the hatch to the International Space Station on Tuesday, heading for a parachute-assisted touchdown in Kazakhstan a few hours later.