Lawrence Grossman, University of Chicago (IMAGE) University of Chicago Caption Lawrence Grossman, professor in geophysical sciences, has devoted much of his career to reconstructing the sequence of minerals that condensed from the solar nebula, the cloud of gas and dust from that formed the solar system 4.5 billion years ago. Credit Dan Dry Usage Restrictions News organizations may use this image in connection with reports about the research of Lawrence Grossman and his colleagues. 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.