Video: Press conference following Falcon launch and landing

Now in the home stretch of a complex, multi-year upgrade, two space station astronauts floated outside the lab complex Thursday and pressed ahead with the third of four spacewalks the current crew is carrying out to complete the replacement of aging batteries in the station’s solar power system.

Following two Falcon 9 launches from both California and Florida, SpaceX closed out the first weekend of December with a Falcon Heavy static fire test. The ignition of the 27 Merlin engines comes a week ahead of the planned launch of the U.S. military’s secretive X-37B spaceplane.

Two Russian cosmonauts stepped outside the International Space Station Wednesday, sent birthday greetings to former cosmonaut Alexey Leonov, the first man to walk in space, and then carried out a full slate of maintenance work.