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Comment by graycat

Something has orbits around galaxies failing to follow the law of gravity from ordinary matter. The orbits are as if there there is some more mass with gravity, mass that doesn't interact with light.

Something is in/near galaxies is bending light as if there were more mass there than there is from just ordinary matter.

So, for that extra mass, call it dark matter.

Seems simple enough.

"Flaw in the theory of gravity?" Maybe, but that seems to be the hard way to get an answer.

parent graycat 11 years ago

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