The Hubble Deep Field. Mankind's deepest, most detailed optical view of the universe. Staring at one tiny spot in the sky for ten days, Hubble kept taking pictures one after another for the entire exposure time, accumulating data. Each exposure was typically 15 to 40 minutes long. Separate images were taken in ultraviolet, blue, red, and infrared light. By combining these separate images into a single color picture, astronomers will be able to infer -- at least statistically -- the distances, ages, and composition of the galaxies in the HDF image.