6 years ago
Scientists weighed all the mass in the Milky Way galaxy. It’s mind-boggling.
Something weird is happening in our galaxy: It’s spinning fast enough that stars ought to be flying off, but there’s something holding them together. The substance that acts as a gravitational glue is dark matter. Yet it’s incredibly mysterious: Because it doesn’t emit light, no one has ever directly seen it. And no one knows what it’s made of, though there are plenty of wild hypotheses.
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