Secrets of icy Dione

Scientists find out some of the secrets of the fourth moon of Saturn. Dione is the fourth largest natural satellite of Saturn. Dione was release the famous Italian astronomer Giovanni Cassini in 1684. However, officially its current name the given satellite of has received only in 1847. Its diameter is 1 123.4 kilometers. This Saturnine satellite of consists predominantly of water ice with considerable admixture of stone breeds of in internal layers of. Scientists have made a similar postulation proceeding from the density of Dione.

The mystery of spiral galaxies and their mysterious sleeves

Astronomers have discovered the largest recognized spiral galaxies and they have identified the "skeleton" of the Milky Way. Our own Milky Way, most likely, is a spiral galaxy. Indeed, our solar system and the Earth are somewhere close to one of his whiskers, pulled back the sleeves.

And almost 70% of the galaxies closest to the Milky Way are a spiral. But despite their general morphology of galaxies, such as our form and retain their characteristic features, which remains a puzzle in astrophysics. Are their sleeves in spiral galaxies? Whether they can appear and disappear over time?

Classification of meteorites

While there are different classifications, one of the most important is the collecting feature of composition and origin of meteorites. In this division we find:

1) Primitive: is the most primitive material in the solar system (they have several billion years) that have remained virtually unchanged since they formed, ie never suffered melting or differentiation processes.