UY Scuti, the largest star in the universe, has a radius that is 1,700 times larger than our sun's. Such a star is also able to undergo Nuclear Fusion of much denser and heavier objects. In other words, it is able to produce a LOT more energy than our sun.
In addition to that, UY Scuti is also 340,000 times more luminous than our sun. It is still incredibly easy to see despite being many thousands of light years away.
Fun fact, UY Scuti also has a circumference of 4.7 billion miles. To put that in perspective, the sun's circumference is 2.7 million miles.
That is one very big star.
While a perfectly flat universe would extend out to infinity , a flat universe with a multiply-connected topology would have finite size. If we could somehow determine whether one or more dimensions are wrapped in on themselves, then we would know that the universe is finite in that dimension. We could then use those observations to measure the total volume of the universe.
But how would a multiply-connected universe reveal itself?
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