Spectra of Exoplanets (image) American Museum of Natural History Share Print E-Mail Caption This graph shows the spectra of all four planets orbiting HR 8799. The plot shows how bright each object is (y-axis) versus the wavelength of light or color measured. Dips and peaks in these plots are due to the presence or absence of certain molecules (indicated at the top of the plot). Credit Courtesy of Project 1640 Usage Restrictions Can be used with appropriate 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.