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babyyodaisamazing98 t1_j9n5cj1 wrote

People seem very irrationally angry at your question.

The answer however is no it wouldn’t explain it away. Dark matter is used to explain why galaxy rotation doesn’t match expectation. It doesn’t matter how long ago the galaxy started rotating, dark matter is still needed to explain the rotation we do see.

In a similar vein the universe accelerating is explained by dark energy, which also doesn’t care about the age of the universe. The fact that it accelerating at all is where the explanation for dark energy comes in.

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phunkydroid t1_j9n5uv9 wrote

>People seem very irrationally angry at your question

I don't see a single reply that looks angry and there are no hidden or deleted replies, what am I missing?

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