http://www.youtube.com/watch?v=5NZjSPe4eAM&feature=player_embedded
Photo in public domain: http://www.wpclipart.com/space/solar_system/Mars/Mars.jpg.html
Visit National Geographic's website on Mars
http://science.nationalgeographic.com/science/space/solar-system/mars-article.html
http://www.youtube.com/watch?v=m5lnavfxZWo&feature=player_embedded