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Ok .. just drumming it into my brain:
There's light emitting things (galaxies, quasars, S/Ns, etc) that:
i) we can presently see;
ii) we can't presently see, but we will be able to see in the future (and we'll see them in their infancy);
iii) we can't presently see .. and never will see (causally disconnected).
However, for type (ii) above, it is conceivable that the light we eventually receive from these things will be redshifted to the point of being physically undetectable anyway, so we are causally disconnected from it anyway.
We should improve our technologies for detecting sub-mircrowave, otherwise we'll miss all the action !
Who is to say that we're not already missing stuff which happened > 13.7 billion years ago, just because we haven't built a detector which can receive it ?
Cheers
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