Ask Astro: If dark matter is invisible, then how do we detect it?

Q: In your feature, “Is the Big Bang in Crisis?” dark matter is called invisible. How was the dark matter in the story’s image of the El Gordo galaxy cluster detected and colorized if it is invisible? William P. Gerhold — Hewitt, New Jersey A: It is true that we cannot see dark matter directly.Continue reading “Ask Astro: If dark matter is invisible, then how do we detect it?”

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