Astronauts Are Taking a Tricky Spacewalk to Fix a Dark Matter Experiment. Here's How to Watch | 11/15/2019 | Tariq Malik
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Two astronauts are taking one of the most complicated spacewalks in NASA history today (Nov. 15) to revive an ailing $2 billion experiment on the International Space Station and you can watch it live online.

European Space Agency astronaut Luca Parmitano, the station's Expedition 61 commander, and NASA astronaut Andrew Morgan are expected to spend. 6.5 hours working outside the orbiting lab on the Alpha Magnetic Spectrometer, a sophisticated cosmic ray detector designed to seek out antimatter and dark matter. It's the first of at least four spacewalks planned to repair the instrument, which has a coolant leak and needs a new cooling system.

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"These will be very was never intended for repair in space!" Morgan said in a Twitter post Thursday (Nov. 13).

You can watch the spacewalk live on, courtesy of NASA TV. Parmitano and Morgan began their work at 6:39 a.m. EST (1139 GMT) as the station sailed 259 miles above the Indian Ocean.

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More: How the Alpha Magnetic Spectrometer Works in Space (Infographic)

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The Alpha Magnetic Spectrometer (AMS) has been part of the space station's exterior since its installation in May 2011. It was designed to last for at least 3 years, relying on a set of four cooling pumps to keep its systems cool. Two of those pumps failed in 2014, raising concerns for the instrument's life.

"We knew we had to do something about it, especially since AMS was getting such compelling science," Ken Bollweg, the AMS program manager, said in a news conference Tuesday (Nov. 12). "We knew we wanted to extend its life."

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NASA astronaut Andrew Morgan (left) and European Space Agency...
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