It takes four spacewalks to get the instrument - which looks for antimatter and dark matter - running again.
The International Space Station can resume looking for antimatter and dark matter after spacewalking astronauts repaired a £1.5bn cosmic ray detector.
The ISS's seven tonne Alpha Magnetic Spectrometer has been malfunctioning since 2014, and it has taken NASA since then to devise a plan to repair its damaged cooling system. The device was taken into orbit on the penultimate space shuttle flight in May 2011. By the time it was shut down late last year, it had studied more than 148 billion charged cosmic rays.Those rays are high energy particles that move through space at nearly the speed of light, NASA explains on its website.Advertisement
NASA's Andrew Morgan and Italy's Luca Parmitano have conducted four space walks since November to get the spectrometer up and running again. NASA said their ventures outside the ISS were the most complicated since the Hubble Space Telescope repair missions two decades ago.
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