Where is the antimatter? Scientists have speculated whether there are places made up of entirely of antimatter -- the opposite of the world that we know.
Scientists at CERN, which helped build the detector, were clearly happy that the instrument safely made it into space and had begun operating Thursday. They tweeted, "#AMS02 is now installed on the ISS, plugged and taking data. Cosmic rays can come now! Congratulation to @NASA and astronauts for great job!"
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