The nature of dark matter is one of the leading mysteries in modern astronomy. In fact, the name ‘dark matter’ is essentially a placeholder for something astronomers know is there but can’t yet thoroughly investigate. Dark matter doesn’t interact electromagnetically, so it doesn’t absorb or give off light. It doesn’t seem to interact with ordinary matter or radiation at all, except through its gravitational influence. That’s how astronomers know it’s there, by the way ordinary matter moves around it.
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