Sphere Photo (image) Northern Arizona University Share Print E-Mail Caption A colorized scanning electron microscope image of a glassy carbon sphere that contains evidence of extraterrestrial impact. The sphere measures about .012 inches in width. Credit SEM imaging by Jim Wittke Usage Restrictions Must include photo credit Share Print E-Mail 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.