I use words like:
"Apparent radius" = 13.7 billion lightyears
"Geometric radius" = alot bigger
But my original post was not a debate over terminology or to start a debate over how big the universe actually is. My original post asked what kind of technology (telescope) could see the super-redshifted light from objects even further than 13.7 billion ly away? The Hubble Deep Field was in the visible spectrum (I assume). But the visible spectrum ends at about 800 nm wavelengths. If the camera can't detect longer wavelengths then it simply can't see objects that are more redshifted, and the universe would appear to "end" at a certain distance from us. So how do we see further? Are radio telescopes capable of "deep astronomy" or are they mostly short-range systems?
Space/Science » in reply to Radius and half-way point
My word usage is a little primitive