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lilrabbitfoofoo t1_jdawhvs wrote

The same results can be achieved by just putting in an appropriate amount of cold normal matter (dust, rocks, planetoids, etc.) into the same functions. We still wouldn't be able to see any of this additional matter and so it would be "invisible" to the EM spectrum (meaning invisible to us).

This provides some evidence of matter being there, not its exotic form or imaginary nature as proposed by "dark matter" theories.