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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.

en.wikipedia.org/wiki/Universe

The prevailing model for the evolution of the Universe is the Big Bang theory. The Big Bang model states that the ...

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 ...

.ask.com/youtube?q=How+Big+Is+the+Universe%3F&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.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.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.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.

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.