[CraigS]

Ok all you relativists out thar .. he's a conundrum question I've been trying to wrap my mind around for a while … this has to do with cosmological event/particle horizons ...

Say there are two exo-galaxies out there, galaxy X and galaxy Y, where X is nearer to us than Y. Now with cosmic acceleration, there will be some last photon from either galaxy after which we will see nothing. Now, at the time X sends out its last photon, there will also be a Y photon passing by X. They both travel at the same speed, and thus they both reach us at the same time (Y will be more redshifted than X). We will see both galaxies blink out together, even though Y is further away (and is presumably younger than X).

So if we think of the entire universe consisting of galaxies of different ages, then this would mean that at one instant we will see our entire observable universe …. and in the next instant … all of it blinks out ??

There is some flaw here, but where is it … ??...

Answerers welcome.

Cheers