A literal shot in the dark by imaging cameras on NASA’s Cassini spacecraft has yielded an image of a visible glow from Titan, emanating not just from the top of Titan’s atmosphere, but also — surprisingly — from deep in the atmosphere through the moon’s haze. A person in a balloon in Titan’s haze layer wouldn’t see the glow because it’s too faint — something like a millionth of a watt. Scientists were able to detect it with Cassini because the spacecraft’s cameras are able to take long-exposure images.