Are some galaxies moving so fast as to be invisible?

25 April 2012

Question

Hi guys,

Thanks for a great show, I just came across the show a couple of months ago and listen every time since.

Since the expansion started in one point with the big bang there must be galaxies that fly away from us in the exact opposite direction of our own galaxy. If these galaxies and our own accelerate there should be cases where the speed relative to each other in the opposite directions is so large that the light can´t reach us anymore (e.g. if both fly away from the big bang center with half the speed of light in opposite direction). If we catch a galaxy that just accelerates and crosses the threshold it should go dark. Are there any cases were such an effect was observed, or are they still too slow, to cause such an effect?

Thanks and keep up the good work.

Claus

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