This is incredible: a massive image mosaic of the Orientale basin on the Moon, constructed from images taken by the Lunar Reconnaissance Orbiter Camera. It’s incredible because the LROC takes fairly close, high-resolution views of the lunar surface, and Mare Orientale, Phil Plait points out, is bigger than Colorado. The full-sized image is at 100-metre resolution and covers an area 1,350 km wide, and results in a 122-megabyte, 185-megapixel image — that’s 13,590 × 13,590 pixels! (Instead of downloading the TIFF file, try the interactive version here.) The LROC team calls this a “preliminary large-area mosaic,” which is to say that there are a few gaps here and there. Still: wow. Credit: NASA/GSFC/University of Arizona.