This is where theoretical science takes over, if you believe in big bang and an inflationary univese, then roughly you can say its infinite although a better term would be ever-expanding.

Light is what we use to explore distant space, the light from stars. We know how fast light travels, so if we know how far away a star is, we know how long ago the star put out the light. From motion of the Earth, looking at a star at different times of the year, we know how far away the most distant galaxies we have ever seen are located. These are stars just coming into being, very young stars. This causes scientists to believe we there are not many stars beyond. Still, there could be. It is possible that a very distant set of galaxies exists on its own, too far away for its light to have reached us yet.



If you use penguin logic, aka organized religion, you'll end up in an endless cycle of junk science.

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