Itokawa Particles (IMAGE) Arizona State University Caption The two Itokawa particles studied by Jin and Bose are tiny: for comparison, a human hair is 100 to 500 microns in diameter. ASU's NanoSIMS instrument made it possible to extract information on the particles' water content. Credit Z. Jin and M. Bose/ASU/JAXA Usage Restrictions No restrictions when used in connection with reportage on this story 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.