Minerals in Particle from Comet Wild 2 (IMAGE) University of Chicago Caption High-magnification view from a scanning transmission electron microscope showing individual mineral grains in the comet sample called Inti. The scale bar is 100 nm long (a nanometer is a billionth of a meter). Credit Image courtesy University of Washington 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.