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

Adapted from Origins, A NOVA Presentation: "Are We Alone?". A Thomas Levenson Productions and Unicorn Projects, Inc. production for WGBH/Boston. First Life Animation © Indiana State Museum. Animation courtesy NASA, ESA, G. Bacon (STSCI), C.R. O'Dell (Vanderbilt Univ.) and the Rose Center for Earth and Space Science/AMNH. Stock Footage courtesy of Vulcan Productions and Paul Gerken.