It can be thought of as a spherical diameter is the usual sense.
More Quotes from Neil Cornish:
All the distance covered by the light in the early universe gets increased by the expansion of the universe. Think of it like compound interest.Neil Cornish
Several years ago we showed that any finite universe in which light had time to 'wrap around' since the Big Bang would have the same pattern of cosmic microwave background temperature fluctuations around pairs of circles.
Neil Cornish
If the universe was finite, and had a size of about 4 billion to 5 billion light-years, then light would be able to wrap around the universe, and with a big enough telescope we could view the Earth just after it solidified and when the first life formed. Unfortunately, our results rule out this tantalizing possibility.
Neil Cornish
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