This illustration is a composite of numerous separate Hubble WFC3 images. A color image composed of exposures made through three color filters shows the disk of Neptune, revealing clouds in its atmosphere. 48 separate images from a single filter were brightened to reveal the very faint moons. The white dots are Neptune's inner moons moving along their orbits during Hubble's observations. The solid green lines trace the full orbit of each moon. The spacing of the moon images follows the timing of each Hubble exposure. About 30 moons are known to orbit Neptune, most of which are too faint or orbit too far away to appear in these images. Image credit: NASA, ESA, and Z. Levay (STScI)