20070309, 16:38  #1 
Bronze Medalist
Jan 2004
Mumbai,India
2^{2}·3^{3}·19 Posts 
Rule for all galaxies.

20070319, 15:14  #2 
"Lucan"
Dec 2006
England
2·3·13·83 Posts 
How does one estimate the mass of a galaxy other than its
speed of rotation? c.f. mass of the Sun? David 
20070320, 05:21  #3 
Mar 2003
New Zealand
10010000101_{2} Posts 

20070320, 06:02  #4 
Sep 2002
787_{10} Posts 

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