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20 Cards in this Set
- Front
- Back
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Size of the Milky way (width by depth)
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100000 ly by 1000 ly
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Number of stars in Milky Way
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200 to 400 billion
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The sun's position in the Milky Way
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in the disk, 2/3 of the way out from the center
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How many years does it take for the sun to go around the milky way once?
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230 million years
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What is the overall shape of the Milky Way?
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barred spiral galaxy
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Three main regions of the Milky Way
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Bulge, Disk, Halo
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Contains Globular clusters
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Halo
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Spherical in shape
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Halo
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Contains ONLY Population II stars
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Halo, Bulge
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contains very little interstellar gas and dust
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Halo
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Flattened shape with spiral arms
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Galactic Disk
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Contains Population I stars
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Galactic Disk
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Interstellar dust, gas, and Population I stars associated with spiral arms
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Galactic Disk
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Center of Milky Way Galaxy
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Bulge
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Football Shape
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Bulge
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Little interstellar dust and gas
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Bulge
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Supermassive Black Hole at the center
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Bulge
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method for determining size and position of milky way galaxy
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kapteyn and shapely method
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tend to be found in globular clusters and the nucleus of a galaxy, tend to be older, less luminous, and cooler, found in bulge/halo, orbits in and out of plane
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Population II stars
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Associated with dense clouds of dust and gas
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Spiral Galaxy
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