"Space," wrote The Bard,"is big. Really big. You just won't believe how vastly hugely mind-boggingly big it is."
And who can argue with that? But seriously, how big is "vastly hugely mind-boggingly big"?
This website will help you comprehend the size of our solar system. It shows the sizes of each member of our solar system in relation to the others, and also shows the distances between each, which is really amazing, especially on the 1:1 scale. You can also jump from one planet to another if you don't have time to mouse from one to the other (hint: most people don't have time for mousing around, but give it a go until your finger gets tired just to get a general appreciation for how "vastly hugely mind-boggingly big" these distances really are).