Models:

1. The Milky Way Galaxy (Top & Side Views)
a. Know location regions for Pop I and Pop II stars
b. Size of Milky Way is roughly 100-120 thousand light years
c. 3 spiral arms
i. Earth is located on the far end of the middle upper arm
ii. Solar system is roughly 26,000 light years from the center of galaxy
d. The bulge is in the center—arms extend out from bulge (This is the disk)
e. Globular clusters exist all around the galaxy.
f. Halo envelops the disk
g. Corona envelopes the Halo
h. Milky was is roughly 13 billion years old
i. The mass of the Milky Way is roughly 10^11 Mass of the Sun.
j. There is believed to be a maxi-black hole in the center of the bulge
i. About 3 million times more massive than our sun.
k. There is believed to be dark matter between the Halo and the Corona
i. Dark Matter may account for as much as 95% of the galaxy's mass
2. The internal structure and crust of the earth.
a. Inner Core
i. 95% iron, 5% nickel
ii. Solid
b. Outer......

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Title: Astronomical Terms & Models
Approximate Word Count: 1722
Approximate Pages: 7 (250 words per double-spaced page)

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