APOD3.7

This is a picture of one of Jupiter's moons, Io, taken by the Cassini spacecraft. The blue plume at the top of the picture is from a volcanic caldera known as Pillan Patera, and has been active for about 18 years. There are actually two such sulfuric eruptions in this picture. The Prometheus Plume, named after the Greek god that gave humans fire, is seen in the middle of the picture at the day/night line. It's shadow can be made out, and it rises about 75 km above the ground. The more readily visible plume at the top rises about 140 km.

Links to a WORLD OF MAGIC AND SHIMMERING SPLENDOR

http://en.wikipedia.org/wiki/Planetary_nebula
http://www.daviddarling.info/encyclopedia/P/planneb.html
http://chandra.harvard.edu/photo/2001/1220/index.html
http://www.seds.org/messier/planetar.html
http://www.news-about-space.org/story/2556.html
http://www.nightskyinfo.com/planetary_nebulae/

APOD3.6

This picture, taken by the Cassini spacecraft, is of lakes of liquid methane on Titan, one of Saturn's moons. Radar analysis of the surface of the cloudy moon was showing that there was little radar reflecting from these lake areas. The image is in false color.

APOD3.5

This picture of Saturn's moon Hyperion was taken by the Cassini spacecraft and shows in false color the spongey details of the cratered moon. At the bottom of the craters lies an unknown dark material. Hyperion is 250 meters across, rotates chaotically, and has so little density that it is suspected to have an elaborate cavern system interior.

By my expert opinion, the unknown dark material is Evil Materia.