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The Scale of the Universe
This is incredible http://apod.nasa.gov/apod/ap120312.html
One of those things that really puts us in perspective.
The Hubble Ultra-Deep Field never ceases to blow my mind. It helps put into perspective how mindbogglingly huge our universe is, something that's understandably difficult to comprehend
http://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field
The zoomed up pictures of those galaxies are probably some of the most beautiful things we'll ever see.