about 80000000000000000000000 miles across ( 8 x 10 to the 22 power). It may be curving back on itself as it expands
universe's equator distance is about 150,000,000,000 light years.
It seems that there is no such thing as a "center of the Universe". Every place you are, the Universe will look the same.
The Universe is continuously expanding. The distance between galaxies increases. The amount of space in the Universe increases.
No one on earth knows. The universe hasn't been measured, and we may never reach the ends of the universe, if the universe ever ends.
From a great distance, our Sun, probably cannot be seen. It is a smaller star in our universe.
The distance is getting larger as the universe expands.
Edwin Hubble.
If it didn't everything in the universe would have gone flying apart long ago and there would be no universe!
It is not currently known how big the Universe is. The observable Universe has a radius of about 47 billion light-years; that is, the most distant objects that can be observed in theory are at that distance. The actual Universe is probably quite a bit bigger.
A light beam that travels for the entire lifetime of the universe would cover a distance of approximately 13.8 billion light-years. This is because the observable universe is estimated to be about 13.8 billion years old in terms of light-travel distance.
That would be the distance from one edge of the Known Universe to the other. As the Known Universe is believed to be approximately 15 billion years old, that would be 30 billion light years in diameter.
Although we can't calculate the exact no galaxies in the universe , because of the vast distance the universe is spread over, The most accepted assumptions holds that there are approximately 100 Billion galaxies in the universe.