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1 .This is Scientific American 60-Second Space. I'm Clara Moskowitz. Got a minute?
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2 .The universe seems to be full of dark matter, yet no one knows what it's made of.
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3 .The best guess is that invisible particles called weakly interacting massive particles, or WIMPs, contribute all this missing mass.
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4 .And that idea matches the latest data generated by the Alpha Magnetic Spectrometer, or AMS experiment.
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5 .This instrument lives on the International Space Station, and it may be seeing direct signs of dark matter.
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6 .The study is in the journal Physical Review Letters.
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7 .The AMS catches charged particles flying through space.
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8 .Its new results show more positrons than expected.
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9 .Positrons are the antimatter counterparts to electrons.
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10 .Normal astrophysical processes create some positrons, but not as many as AMS registered.
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11 .One possible explanation is that these excess positrons are a by-product of dark matter interactions.
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12 .That is, they're being created by the elusive WIMPs.
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13 .When two WIMPs collide, they can annihilate each other, giving rise to other particles, such as positrons.
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14 .The data from AMS so far match these predictions.
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15 .The positrons might also have a more mundane source, such as the spinning stars called pulsars.
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16 .Time will tell if the space-based AMS has indeed seen the first sign of what makes up dark matter, or if we're still stuck in the dark.
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17 .Thanks for the minute, for Scientific American 60-Second Space. I'm Clara Moskowitz.
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