This site is amazing I can't stop scrolling. I showed the boys and they are fascinated by it too.
You can get an idea of the scale of things and can scroll in and out past various sizes for ages.
Great for kids and adults alike.
Check it out..
http://images.4channel.org/f/src/589217_scale_of_universe_enhanced.swf
We enjoyed looking at it too! It's really quite amazing.
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