Molecule (IMAGE) Arizona State University Caption A molecule, whose path traced out in time is shown by the blue line, occasionally wanders into a brightly lit green region. Within this region, the molecule is excited and begins emitting light of a different wavelength that we can distinguish from the green light. This emitted-light reports back on the behavior of the molecule. Credit Steve Presse Usage Restrictions Contact for permission to use 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.