From a recent review:
Most of us have trouble visualizing the height of buildings, or the distance it takes to get home from work, let alone things on an intergalactic scale. The above interactive graphic made by 14-year-old Cary Huang may be the best tool to help us understand our place in our vast universe. The interactive piece allows the viewer to zoom through scale and space, from quarks to galactic clusters. The real genius of the interface is the ability to scroll back to a familiar object like a car - the time spent scrolling helps to convey a sense of size and distance. Even cooler are the tidbits of information that are provided when you click on an object.
Honestly, folks, if you only ever click on one of these pages that I share with you, let it be this one. It's that good.