Dark Matter: What We Can’t See

It’s been a particularly bad week for skywatching in Chicago, with the rain, the clouds, the snow, and then the bitterly cold. Driving home after a storm, the night sky was completely obscured by thick, black rainclouds that seemed to absorb even the glow of the city lights. That got me thinking about dark matter, all the stuff in the universe we can’t see. Here’s Minute Physics:

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