Dark Matter Particles Are Like Billiard Balls

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Dark matter particles are like billiard balls. They can hit each other and then lose energy by emitting some photons, that makes them stick together. Dark electromagnetism is an open possibility but the coupling would be very small so it probably wouldn't be noticeable. There's lots of dark matter in the galaxy; there's some dark matter in this solar system,. But a very, very tiny amount compared to the density of matter that we have in ordinary matter.

Welcome to the February 2023 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patreons, whittle them down to a more manageable number — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

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The big news this month is the successful awarding of the first ever Mindscape Big Picture Scholarship. Congratulations to Lyat Melese and Rehman Hassan! We continue to collection donations for next year’s scholarship contest.

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