Michael Weil, Colorado State University (IMAGE) Colorado State University Caption Professor Michael Weil said scientists know very little about these types of radiation and their effects on humans, because exposure on earth is very limited. Credit Colorado State University Photography Usage Restrictions None 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.