"Then the issue I & # 8217 ; ve raised has some merit ? Is dark matter the only possible thing we can & # 8217 ; t see using EM waves , or could there be other things that could throw off our conclusions at these great distances ?"
"Throw off our conclusions about what ? I 'm getting a bit confused as to what you 're trying to cast doubt upon . Dark matter is stuff that does n't interact via the electromagnetic force , so again by definition anything that we ca n't 'see ' using EM waves is dark matter . this is an interesting article about one way we can observe it indirectly"
"the issue I ve raised has some merit ? conclusions at these great distances ?"
"conclusions about what ? Dark matter is stuff that does n't interact"