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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.

Observable universe - Wikipedia

en.wikipedia.org/wiki/Observable_universe

... much information on the content and character of the universe's structure. The organization of structure appears to follow ...

How to Picture the Size of the Universe | WIRED

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 ...

How big is the universe? - Phys.org

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 ...

It took centuries, but we now know the size of the Universe - BBC

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 ...

NASA - How Big is Our Universe?

www.nasa.gov/audience/foreducators/5-8/features/F_How_Big_is_Our_Universe.html

Jul 15, 2004 ... The universe is a big, big place. But how big? And how do we know? Throughout history, humans have used a variety of techniques and ...

www.ask.com/youtube?q=How Large Is the Universe?&v=AC7yFDb1zOA
Feb 12, 2013 ... 'You'll never get your head around how big the universe is,' warns astronomer Pete Edwards of the University of Durham in this film about ...
www.ask.com/youtube?q=How Large Is the Universe?&v=yaX4iGw-b_Y
Sep 18, 2012 ... The universe has long captivated us with its immense scales of distance and time . How far does it stretch? Where does it end, and what lies ...

How Big is the Universe? - Space.com

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

Dec 24, 2013 ... 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.

How Big is the Entire Universe? – Starts With A Bang - ScienceBlogs

scienceblogs.com/startswithabang/2012/07/18/how-big-is-the-entire-universe/

Jul 18, 2012 ... The Universe is a vast, seemingly unending marvel of existence. Over the past century, we've learned that the Universe stretches out beyond ...