5 Things Dark Matter Might Be, According to Scientists: Galaxies


WIMPs and MACHOs might exist at two ends of a spectrum, but the axion is in a place all its own. This slow-moving particle is lighter than a WIMP and interacts weakly with other matter, but can also decay into photons — and we might be able to detect that decay.

What’s more, if axions are dark matter, they could only exist in a very specific mass range, and that makes it even easier to design experiments to test for them. Supernovas and stars like our sun should produce these particles, and scientists are using these astronomical objects to try and detect them.

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