Galactic Bulge
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Transcript: The third component of the Milky Way is the bulge of our galaxy. This concentration of stars is centered on the galactic center but is much smaller than the halo. The stars in the bulge are mostly old and red, but many are younger than the halo stars with ages of only a few billion years. The bulge is best seen with infrared observations that can penetrate the obscuring dust that lies in the plane of the disk of our galaxy.
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Transcript: The motions of stars and gas within the disk of the galaxy can be used to estimate the mass of the Milky Way galaxy, but the Sun is one of billions of stars, some of which are interior to the Sun’s orbit and some of which are far beyond the Sun. So how is it possible to do this? ...
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