In reply to Mauro Lacy's message of Thu, 13 Jan 2011 09:23:01 -0300: Hi, [snip] >Let's calculate the acceleration produced by 200 million suns. This is >doomed to fail because, as we know, galaxies don't obey Newton's >gravitational law, but just to have an idea: >a= Fg/msun = G msun*2*10^11/(26000 * 9.4607305e+15)^2 = >4.3882998825*10^-10 m/s^2 > >Which is two times the centripetal acceleration... if we suppose that >the central bulge contains half the visible mass, the standard >calculation will coincide with the observed values for our Sun. But it >will fail for stars farther from the center, which are also moving at >250 km/s. > >In the wikipedia entry >https://secure.wikimedia.org/wikipedia/en/wiki/Milky_Way >you can see the expected vs. observed galactic rotation curves >https://secure.wikimedia.org/wikipedia/en/wiki/File:Rotation_curve_%28Milky_Way%29.JPG > >And they inf fact coincide in the case of our Sun. > >Anyways, any effect smaller than, let's say, 2*10^-11 m/s^2, can be >safely ignored. [snip] I would be interested in a calculation of the strength of the magnetic attraction/repulsion between the galactic magnetic field and the Solar magnetic field, and by how many orders of magnitude it differs.
Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/Project.html
