View Full Version : A New Spin On NGC 2403

2011-Mar-06, 01:50 AM
No. You’re not looking at a Hubble image. This incredibly detailed photo was taken 14.5″ telescope from right here on the surface of planet Earth. When Allan Sandage turned the Hale telescope its way, he discovered the first Cepheid variables beyond our local galaxy group. At the time he concluded its distance as about 8,000 [...]

More... (http://www.universetoday.com/83778/a-new-spin-on-ngc-2403/)

2011-Mar-06, 06:43 PM
Somebody is going to have to explain to me the explaination of how they determined that that galaxies spiral arms were moving at diffrent speeds. It's not like you're going to watch it spin through a couple of rotations.