sign up (free!)
Saturn's Iapetus: Painted Moon- Vast sections of this strange world are dark as coal, while others are as bright as ice. The composition of the dark material is unknown, but infrared spectra indicate that it possibly contains some dark form of carbon. A leading hypothesis is that the dark material is mostly dirt leftover when relatively warm but dirty ice sublimates.
Arches Cluster is the densest known star cluster in the Milky Way, and is located about 100 ly away from the center of our galaxy, in the constellation Sagittarius. The radius of the cluster is approx. 1 ly. It contains about 150 young, very hot stars - many times larger & more massive than our Sun. NASA Hubble.
"NGC 3603 also contains some of the most massive stars known. These huge stars live fast and die young, burning through their hydrogen fuel quickly and ultimately ending their lives in supernova explosions."