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.
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
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 ...
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.
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, ...
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 ...
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.
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 ...
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 ...