Dust Particle from Comet Wild 2 (IMAGE) University of Chicago Caption A transmission electron microscope image (magnified 5,000 times) of a slice of the Inti particle, which NASA’s Stardust spacecraft collected in 2004 and returned to Earth two years later. Preparation of the sample caused some breakage. Scale bar is one micron, or one millionth of a meter. Credit Image courtesy University of Chicago Usage Restrictions This image may be reproduced by news organizations in reports about NASA's Stardust mission to comet Wild 2. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.