... Clouds near the horizon can block sunlight from reflecting off air, making columns outward from the Sun appear unusually dark. ... Images from the Cassini spacecraft currently orbiting Saturn have uncovered long rows of huge sand dunes near Titan's equator that rise as high as 300 meters. ... What planet is this? ... Prometheus Creating Saturn Ring Streamers . ... Specifically, an orbital dance involving Saturn's moon Prometheus keeps creating unusual light and dark streamers in the F-Ring of Saturn...