In the space walk work that wrapped up today, Fincke and Lonchakov also uninstalled a long-term Russian experiment that exposed biological samples to space.

The pair also installed and then uninstalled technology for a European Space Agency experiemnt that would have subjected biological materials to the rigors of space. However, the experimental package, called Expose-R, failed to send data to Mission Control Moscow, so it was immediately dismantled and will be brought back to Earth, NASA reported.

Fincke and Lonchakov did successfully set up what the agency called an Impulse experiment that will measure disturbances in the ionosphere around the station.

NASA also announced that it has set up where people can send holiday greetings to the people onboard the International Space Station.