©2006, 2004 WGBH Educational Foundation. All rights reserved.

Adapted from Origins, A NOVA Presentation: "Back to the Beginning". A Thomas Levenson Productions and Unicorn Projects, Inc. production for WGBH/Boston. Animation courtesy of Edgeworx, NASA and W. Feimer (STScI), NASA and STScI. Simulation courtesy of Tom Abel, Greg Bryan and Michael Norman. Visualization courtesy of Ralf Kahler and Tom Abel.