NASA today unveiled an interactive computer simulation that allows virtual explorers of all ages to dock the space shuttle at the International Space Station, experience a virtual trip to Mars or a lunar impact, and explore images of star formations taken by the Hubble Space Telescope. In the Deep Space Network demonstration, visitors learn how NASA communicates with the Mars Exploration Rovers, Sprit and Opportunity, by using the Madrid Deep Space Network antenna to send data to the Mars Reconnaissance Orbiter, which then relays the data to the rover.