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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

en.wikipedia.org/wiki/Observable_universe

Some parts of the Universe are too far away for the light emitted since the Big Bang to have had enough time to reach Earth, so these portions of the Universe lie ...

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 ...

www.ask.com/youtube?q=How Big 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 ...

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 to Picture the Size of the Universe | WIRED

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

Dec 6, 2011 ... To try imagining how big, place a penny down in front of you. ... In this gallery, Wired will look at the size and scale of the universe's largest, ...

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 ...

How Big is the Universe? - Universe Today

www.universetoday.com/113786/how-big-is-the-universe-2/

Aug 11, 2014 ... The Universe is big, but how big is it? That all depends on whether the Universe is finite or infinite. Even the word "big" is tough to get clear.

How Big Is The Universe: An interactive answer | BGR

bgr.com/2015/07/15/how-big-is-the-universe/

Jul 15, 2015 ... How Big Is The Universe. With all of the commotion and intrigue surrounding the New Horizons spacecraft approaching Pluto, the BBC recently ...

Experience Just How Big the Universe is, in One Mind-Blowing ... - Mic

mic.com/articles/81873/experience-just-how-big-the-universe-is-in-one-mind-blowing-interactive

Feb 11, 2014 ... The Scale of the Universe 2. Use the scroll bar. Click on objects. to zoom in and out. to learn more. By Cary Huang. Technical support by ...

Popular Q&A
Q: How big is the universe?
A: Scientists have demonstrated that the universe is expanding in size, with galaxies moving farther from one another (objects within a galaxy, like the planets in... Read More »
Source: www.answers.com
Q: HOW BIG IS OUR UNIVERSE?
A: The visible universe is around 93 billion light years across. Light from the edge of the visible universe has been traveling 13.7 billion years to reach us, but... Read More »
Source: answers.yahoo.com
Q: How big is the universe?
A: The age of the universe is about 13.75 billion years, but due to the expansion of space we are observing objects that were originally much closer but are now co... Read More »
Source: answers.yahoo.com
Q: How big would the universe be?
A: If the earth were the size of an atom, the universe Read More »
Source: www.chacha.com
Q: How big is the universe?
A: The universe is a big, big place. Recent measurements revealed that the Universe is at least 150 billion light-years in diameter. Read More »
Source: www.kgbanswers.com