Spacewalking astronauts venture out for the second week in a row to repair a cosmic ray detector, this time actually cutting into the $2 billion instrument.
Catch up on the developing stories making headlines.
The International Space Station’s Luca Parmitano sliced through eight stainless steel tubes, using hardware store-type bolt cutters. That set the stage to install new coolant pumps during the third spacewalk on Dec. 2. NASA likened the repair work to heart bypass surgery. At least four spacewalks are needed to fix the spectrometer, on the hunt for elusive dark matter and antimatter for 8 ½ years. Without a new cooling system, the experiment — led by a Nobel laureate — would end.
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