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This is Scientific American 60-Second Space. I'm Clara Moskowitz. Got a minute?

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The universe seems to be full of dark matter, yet no one knows what it's made of.

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The best guess is that invisible particles called weakly interacting massive particles, or WIMPs, contribute all this missing mass.

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And that idea matches the latest data generated by the Alpha Magnetic Spectrometer, or AMS experiment.

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This instrument lives on the International Space Station, and it may be seeing direct signs of dark matter.

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The study is in the journal Physical Review Letters.

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The AMS catches charged particles flying through space.

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Its new results show more positrons than expected.

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Positrons are the antimatter counterparts to electrons.

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Normal astrophysical processes create some positrons, but not as many as AMS registered.

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One possible explanation is that these excess positrons are a by-product of dark matter interactions.

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That is, they're being created by the elusive WIMPs.

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When two WIMPs collide, they can annihilate each other, giving rise to other particles, such as positrons.

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The data from AMS so far match these predictions.

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The positrons might also have a more mundane source, such as the spinning stars called pulsars.

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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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Thanks for the minute, for Scientific American 60-Second Space. I'm Clara Moskowitz.

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