Photo: (NASA via AP)
This March 25, 2009 photo provided by NASA shows the International Space Station seen from the Space Shuttle Discovery during separation. In the background is Earth's atmosphere seen as a blue arc.
Updated: November 15, 2019 06:09 AM
Astronauts have begun an extraordinarily complicated series of spacewalks to fix a cosmic ray detector at the International Space Station.
Italian astronaut Luca Parmitano and U.S. astronaut Andrew Morgan ventured out Friday with dozens of tools and four new pumps for the Alpha Magnetic Spectrometer. NASA considers these spacewalks the most difficult since the Hubble Space Telescope repairs a few decades ago.