Video: Soyuz MS-01 leaves the space station for landing

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.

NASA has ordered a second commercial crew ferry ship from SpaceX, NASA announced Friday, as the agency continues its on-going push to develop U.S.-built spacecraft to carry astronauts to and from the International Space Station, ending sole reliance on Russian Soyuz vehicles.

Bigelow Space Operations says it will charge $52 million per seat to send private astronauts to the International Space Station aboard Crew Dragon ferry ships, and has already paid “substantial sums” to SpaceX for up to four dedicated crew missions to the orbiting research complex.