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Sephiroth · 07-04-2025, 20:22

"Can't travel faster than the speed of light" relative to what?

I mean - is the Universe really expanding just because the red shift of light emanating from a known galaxy has red-shifted further? And when we can no longer observe the other galaxy that is moving away from us, is that because we don't have the instrumentation to detect lower and lower electro-magnetic frequencies?

And, what is dark matter? Is dark energy the the counterpart to E-MC^2?

07-04-2025, 20:22	#27
Sephiroth Wisdom & truth Join Date: Jul 2009 Location: RG41 Services: RG41: 1Gig VOLT Rutland: Gigaclear 400/400 Posts: 12,445	Re: The speed of light, etc "Can't travel faster than the speed of light" relative to what? I mean - is the Universe really expanding just because the red shift of light emanating from a known galaxy has red-shifted further? And when we can no longer observe the other galaxy that is moving away from us, is that because we don't have the instrumentation to detect lower and lower electro-magnetic frequencies? And, what is dark matter? Is dark energy the the counterpart to E-MC^2? __________________ *Seph.* My advice is at your risk.