There is an error in this article. These Cassini results are based on thermal-infrared, not near-infrared data. The measurements were taken by the Composite Infrared Spectrometer and covered the spectral range from 100 to 450 inverse centimeters (100 to 22 micrometers).

John Pearl
Greenbelt, Md

The Cassini craft also looks at near-infrared wavelengths, but not in this case. The word near should have been omitted .—R. Cowen Note: The correction noted has already been made to the online text, above .—Ed.