... It is, in fact, a Seyfert type 2 spiral galaxy. The "S" is actually a lane of stars, gas and dust circling the core. Jupiter's Colorful Clouds . ... The Hydra Cluster of Galaxies . ... A Violet Moon . ... 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. ...