I investigate Mars with HiRISE, the largest telescope sent to another planet. There are 14 CCD sensors on the HiRISE, and each CCD is 128x2048 pixels. During capture, the camera halves each CCD into two 1024-pixel-wide channels and results in 28 strips. Each line is a record that is then stitched back together. Compressed images average between 400 and 800MB, but have been as large as 2GB.