PDA

View Full Version : Spirals, Tides, and M51



Fraser
2009-Dec-11, 07:40 PM
Spiral galaxies are undoubtedly one of the most beautiful structures in the universe. Yet, their simple elegance belies a complex nature. How do such structures not "wind up" and what causes them in the first place? The answers to these questions is a long standing challenge. Under one model, spiral structure is created by spiral [...]

More... (http://www.universetoday.com/2009/12/11/spirals-tides-and-m51/)