On Jul 7, 10:38*am, "Neil" wrote:
Hi Chris

"Chris.B" wrote in message

...

Q: Images of distant galaxies contain both light and dark matter that is
only visible to us...
Dark matter and dark energy are not merely the absence of light.

Good point (I stand corrected as usual) but it isn't visible to us (yet)
which is why it's dark isn't it?


Neil

I wasn't trying to correct you. Merely disguisuing the fact that I had
no useful answer to your question.

Following your logic the radiation from dark matter (if any) would
need to have a very low velocity not to have got here by now from the
nearest object containing dark matter.This assumes you had a detector
which could sense its presence once it got here if it was not in the
form of light. Dark matter cannot become light or "light up" in the
distant object otherwise it would get here at exactly the same speed
as light. Our universe would be constantly getting brighter as dark
matter converted to light emitting matter.