This is an amazing site that will give you the sense of the depth and breadth of our solar system – with a tinge of humor added to it.  It begins by showing the size of the moon as one pixel.  Then, by scrolling horizontally, the user can take a trip through our solar system beginning from the sun.  You not only see the relative sizes of each of the objects compared to the moon, but also the massive distances covered in space between each one.  To keep you from getting too bored with the tremendous amounts of scrolling, Josh Worth interjects witty comments every once in awhile.  This is a great way to show students the enormity of space in a way that they can understand.

For more sites like this, check out “5 Resources to Help Students Understand the Size of the Universe” from Richard Byrne.