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Spacewalkers replace the cooling pumps of the ISS cosmic particle detector

Two astronauts just finished successfully repairing the cooling pumps of the Alpha Magnetic Spectrometer fitted to the International Space Station.
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Matter and antimatter were created during the big bang in equal amounts. However, matter and antimatter annihilate each other and the reason why the universe is ruled by matter today is not clear. Then to shed more light on this phenomenon, the Alpha Magnetic Spectromete...

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