NASA has complied a "flipbook" of short animations that show sky scans taken over several years. Participants can search for disruptions in the images -- basically, clusters of tiny colored dots -- and mark their findings. The goal is to pinpoint real moving celestial objects. Users can then share and discuss their subjects in an online bulletin board. The "flipbooks" were compiled during a mission by NASA's Wide-field Infrared Survey Explorer (WISE). The infrared-wavelength astronomical space telescope can detect darker objects that are farther away. There is a broad area -- around four light-years -- between Neptune and the nearest star, Proxima Centauri, that receives very little sunlight.