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The Crab Nebula changed over time, but it's of course a different kind of "nebula" https://esahubble.org/images/opo9622b/

Maybe the horsehead nebula is different from 1 million years ago.

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From the article: "The gas clouds surrounding the Horsehead have already dissipated, but the jutting pillar is made of thick clumps of material that is harder to erode. Astronomers estimate that the Horsehead has about five million years left before it too disintegrates."

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