What is a galactic bulge?
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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.
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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.
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M$
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
