NASA: Eyes On The Solar System [Currently Beta]
Link: Eyes on the Solar System
Note: This required a plugin to run: UnityWebPlayer [This is downloaded from the same webpage] Once UnityWebPlayer is installed Eyes on The Solar System runs from your browser.
"Eyes on the Solar System" is a 3-D environment full of real NASA mission data. Explore the cosmos from your computer. Hop on an asteroid. Fly with NASA's Voyager 2 spacecraft. See the entire solar system moving in real time.
My screenshots don't do it justice. If you are interested in this topic best to have a look for yourself.