scale

[Fledermaus]

for the scientifically inclined. 

big...
http://www.amnh.org/news/2009/12/the-known-universe/

...and small
http://learn.genetics.utah.edu/content/begin/cells/scale/

 

[Applejack]

I'm pretty much obsessed with the size of the Universe. My mind cant grasp that we are on a giant ball floating in outer space spinning around a giant ball of fire. 

Great video.