Halo in Tampere (IMAGE) Ural Federal University Caption A photo of a halo of diamond dust was made on December 12, 2010 in Tampere (Finland). Credit Marko Riikonen Usage Restrictions Photo may be freely used to illustrate this topic, but please credit the author of the image: Marko Riikonen License Original 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.