Way cool animated multimedia presentation you and your students should check out. There's a timeline along the bottom that takes you through the decades of space exploration. One subtle feature you may miss: watch the changing icon in the upper left corner of the screen go from a jukebox to an ipod as you progress through the decades, and listen to the musical soundtrack. You can change the song that's playing by clicking on the player controls beneath the media player.
This is a must see! http://www.nasa.gov/externalflash/50th/index.html