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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.

Universe - Wikipedia

en.wikipedia.org/wiki/Universe

The size of the Universe is somewhat difficult to define. According to a restrictive definition, the Universe is everything within ...

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

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 ...

How to Picture the Size of the Universe | WIRED

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

Dec 6, 2011 ... Scientists argue over the exact shape and size of the universe but they can calculate one thing with good precision: how far away we can see.

How Big is the Universe? - Space.com

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

Dec 24, 2013 ... This might seem to imply that the entire universe lies within our view. But the size of the universe depends on a number of things, including its ...

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 ... The visible universe is 13.8(or so) billion light-years in size while the ...

NASA - How Big is Our Universe?

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

Jul 15, 2004 ... That's why the sun, which is a million times the size of the Earth, looks so small. It would take the Space Shuttle seven months to fly there.

www.ask.com/youtube?q=What Is the Size of the Universe?&v=AC7yFDb1zOA
Feb 12, 2013 ... 'There are as many stars in the universe as there are grains of sand on ... And supposing our galaxy were the size of a grain of sand, how big ...
www.ask.com/youtube?q=What Is the Size of the Universe?&v=hscvqDuHMlY
Jan 5, 2013 ... From nano-meters to billions of light years. Music By: J. Hardy - ParaBelief http:// soundcloud.com/john-harrison-hardy-jr/parabelief.

Measuring the age and size of the Universe | ESA/Hubble | ESA ...

www.spacetelescope.org/science/age_size/

The top ranked scientific justification for building Hubble was to determine the size and age of the Universe through observations of Cepheid variables in distant ...