In July 2005, NASA's Deep Impact probe collided with comet Tempel 1, providing the first-ever glimpse of the interior of one of these "dirty snowballs" and valuable insight into the formation of our solar system.
Documentary
All you need is an internet connection, a device that can go online, and a passion for great entertainment. There are no subscriptions or commitments — watch as much or as little as you like, whenever you want.