Aha! Here's a question then
Radio telescopes can see to a redshift of 3000.... Is that a distance? Or a time?
If they can see a the CMB, but only a few centimeters away, that's not really what I was after. I understand that waaaaaaaay back x-billennia ago the universe wasn't even transparent to light. But what about radio? Are there longer EM waves in existence? What about gravity? What would allow us to see through the opaque phase of the big bang, out to 20-30 billion lightyears distance?