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All the pieces add up to 78 billion-light-years. The light has not traveled that far, but "the starting point of a photon reaching us today after travelling for 13.7 billion years is now 78 billion light-years away," Cornish said. That would be the radius of the universe, and twice that -- 156 billion light-years -- is the diameter. That's based on a view going 90 percent of the way back in time, so it might be slightly larger.
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And to think, that's only a very small part of the overall Universe. That 156 billion light years is only what we can see within our small bubble of space. The geometry of our space is flat to within 1/10^6 of a %. How big might that make the whole universe??....probably 100's or 1000's of times larger than that still. Could even be infinite in size, we just don't know.