NASA Astronaut Kate Rubins, Crewmates Return Safely to Earth NASA astronaut Kate Rubins, along with Roscosmos cosmonauts Sergey Ryzhikov and Sergey Kud-Sverchkov, returned to Earth on Saturday, following six months living and working aboard the International Space Station. http://www.nasa.gov/press-release/nasa-astronaut-kate-rubins-crewmates-return-safely-to-earth