Sunita Williams and Barry Wilmore, who were stranded on the International Space Station due to a spacecraft malfunction, spent six months in space.
The robot's flexible arms are a technology demonstration that could one day aid in satellite maintenance and space debris management.
Barry Wilmore and Suni Williams will now come home in March at the earliest, to allow SpaceX and NASA engineers to complete development of a new Crew Dragon spacecraft.
NASA has delayed the return date for Boeing's Starliner astronauts Butch Wilmore and Suni Williams. CBS News' Manuel Bojorquez reports on the decision to keep the two in space.
Nasa astronauts Sunita Williams and Don Pettit posed for a cheerful picture ahead of Christmas celebrations on the ISS.