What are the farest reaching astronomical observations of visible light or radio waves? Is it something like 10 billion (10^9) light years? I just wonder: are we sure that the universe is bigger than these 10 billion light years? What if it were only 8 billion light years in diameter? Would we then be able to see the Milky Way like it was 8 billion years ago? Does anyone know what kind of observation tells us that the universe is not actually quite "small" and we are looking once, twice, three times around it already? Thanks, Harald.