Genesis of a Comet Artist Concept

This artist animation depicts one of the most widely accepted theories pertaining to the origin of comets. This image is courtesy of NASA Spitzer Science Center at the California Institute of Technology, Pasadena, Calif.

This artist animation depicts one of the most widely accepted theories pertaining to the origin of comets. This image is courtesy of NASA Spitzer Science Center at the California Institute of Technology, Pasadena, Calif.

CometSpitzer Space Telescope