Video: Change of command aboard International Space Station

Two space station astronauts are gearing up for a planned six-and-a-half-hour spacewalk Friday to replace a presumably shorted out solar array voltage regulator that knocked one of the lab’s eight power channels out of action late last year.

Targeting a resumption of Antares cargo launches to the International Space Station as soon as July, Orbital ATK plans to roll out an upgraded Antares rocket to a launch pad in Virginia this week for a 30-second firing of the booster’s new engines.

America’s most experienced space flier and her three private astronaut crewmates undocked from the International Space Station and plunged back to Earth late Tuesday, blazing through the night sky like a fiery shooting star before splashing down in the Gulf of Mexico.