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The actual size of the entire universe is unknown.
The estimated the size of the observable universe--the part of the universe that can be seen—can theoretically be measured, however. Estimates vary based on different models of the universe’s expansion.

en.wikipedia.org/wiki/Observable_universe

... (in particular 21-cm emission) have yielded much information on the content and character of the universe's structure.

www.space.com/24073-how-big-is-the-universe.html

Jun 6, 2017 ... Based on what we can observe, the universe appears to be almost 28 billion light -years in diameter. However, it is far larger than that.

phys.org/news/2015-10-big-universe.html

Oct 5, 2015 ... Our brains struggle to comprehend how big the universe is because everything here on Earth, and even the Earth itself, is very small when ...

www.wired.com/2011/12/universe-size

Dec 6, 2011 ... No one knows exactly how large the universe is. It could be infinite or it could have an edge, meaning that traveling for long enough in one ...

www.bbc.com/earth/story/20160610-it-took-centuries-but-we-now-know-the-size-of-the-universe

Jun 13, 2016 ... He thought, correctly, that there were many other galaxies as big as our own spread throughout the Universe. But, interestingly, his starting ...

www.ask.com/youtube?q=How+Big+Is+the+Universe%3F&v=AC7yFDb1zOA
Feb 12, 2013 ... "The Universe" is big but that means it ends sometime/somewhere... what's past that point? 2. If seen from Andromeda, the Earth appears ...

cosmosmagazine.com/space/how-big-is-the-universe

Jul 17, 2017 ... There is no bigger empirical question in astrophysics than how big space is. ... In one sense the edge of the universe is easy to mark out: it's the ...

www.express.co.uk/news/science/725985/how-big-is-universe-cosmos-milky-way-solar-system

Oct 27, 2016 ... THE UNIVERSE is incomprehensibly huge, and as humans, we will probably never be able to wrap our heads around just how big it is.

www.forbes.com/sites/startswithabang/2017/03/24/how-big-was-the-universe-at-the-moment-of-its-creation

Mar 24, 2017 ... Thanks to the Big Bang -- the fact that the Universe had a birthday, or that we can only go back a finite amount of time -- and the fact that the ...