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 M¢25  Funded By Mahalo ? |  November 08, 2009 03:56 AM

What is a galactic bulge?

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November 08, 2009 05:54 AM
Here are some facts related to Galactic bulge based on web search.
---quote---
As you go closer to the center of the Milky Way, the distribution of stars becomes vertically thicker. This is not an actual thickening of the disk, but rather a sign of a different component of the galaxy - the galactic bulge.

The Galactic bulge is the central spheroid of our Galaxy, containing about one quarter of the total stellar mass of the Milky Way (M_bulge=1.8x10^10 M_sun; Sofue, Honma & Omodaka 2009). Being older than the disk, it is the first massive component of the Galaxy to have collapsed into stars.

--end quote---
Source(s):
http://burro.cwru.edu/Academics/Astr222/Galaxy/Structure/bulge.html
http://arxiv.org/abs/0910.5133

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November 08, 2009 10:44 AM
----quote---
A galactic bulge is a huge, tightly packed group of stars. The term commonly refers to the central group of stars found in most spiral galaxies.
------end of quote----

Source(s):
http://en.wikipedia.org/wiki/Spiral_galaxy


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