Live coverage: Japanese cargo craft arrives at space station

Watch the post-launch news conference from the Kennedy Space Center following the successful launch of an Atlas 5 rocket on December 6, carrying the Orbital ATK Cygnus cargo ship bound for the International Space Station.

Two astronauts floated outside the International Space Station early Friday for the first of four planned spacewalks to wrap up a complex multi-year job to replace 48 aging batteries in the lab’s solar power system with 24 more powerful lithium-ion units.

A Falcon 9 rocket took off for its fourth flight of the year Friday with a middle-of-the-night mission for SKY Perfect JSAT, a Tokyo-based satellite operator. The JCSAT 14 communications satellite launched from Cape Canaveral at 1:21 a.m. EDT (0521 GMT), and the rocket’s first stage booster made a successful landing at sea a few minutes later.