IMAGING SCIENCE by Richard S. Wright, Jr. Science with Astrophotography Your pretty pictures can contain valuable information. ASSIGNED COLOR Astronomers use false or representative color to help convey information in images of emission nebulosity, but that doesn't make the photo less useful. This narrowband composite photograph of the North America and Pelican nebulae (NGC 7000 and IC 5070, respectively) assigns images recorded through O III, Hα, and S II narrowband filters to the blue, green, and red channels in this picture to highlight the structure each gas contributes to the overall nebulous region. All photos courtesy of author unless otherwise noted. 36 MARCH 2 021 * SK Y & TELESCOPE