... Jupiter's moon Io has active volcanoes. ... It is, in fact, a Seyfert type 2 spiral galaxy. ... Jupiter's Colorful Clouds . ... What makes the colors in Jupiter's clouds? ... The Hydra Cluster of Galaxies . ... The view looks down on the Moon.. Tonight: A Blue Moon . ... Exactly once in a Blue Moon. In fact, the modern usage of the term "Blue Moon" refers to the second Full Moon in a single month. ... Brittany, age 7, and D.J., age 12, ponder this question over dinner one evening. ...