Remember that powers-of-10 video from the 1970's? this one: http://www.youtube.com/watch?v=0fKBhvDjuy0
Here's an interactive version:
I love this. I tend to dwell at the bit where it shows stars that are bigger than our entire solar system: it blows my mind.
This is not quite as cool but an interesting variation of the same theme: http://www.chronozoomproject.org/#/t55
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