The Alpha Magnetic Spectrometer has served during the last six years as a silent witness to the formation of the universe, quietly collecting about 100 billion cosmic rays, particles, and nuclei with energies up to 1 trillion electron volts. “The results show unexpected phenomena—they are not predicted by current cosmic ray models—and this is changing our understanding of the cosmos,” principal investigator Sam Ting told Ars.
But as this publication recently reported, there is a problem with the AMS particle detector’s cooling system, and NASA is planning an extensive set of repairs.

This will likely include a series of “Hubble-esque” spacewalks in 2018 to install a new cooling system for the $2 billion instrument.

After the initial story, Ting provided Ars with more information about the scope and timing of the repairs.
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