Space is big. In fact, space is so big that calling it big is an understatement. Trying to get this enormous size across is one of the greatest challenges of teaching astronomy. I have seen a lot of demonstrations and images trying to get across this very concept. Recently while browsing the Internet, I found a image that blew me away. I think this brings together the relative sizes and distances in the solar system in a very clean and easy-to-understand graphic. It is simple, while still including details such as light travel times, past and future spacecraft, and some of the more recently discovered dwarf planets. It is a very long image, so click on the link to see the whole thing. It is well worth your time.
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Source: SPACE.com: All about our solar system, outer space and exploration