The Milky Way

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The Milky Way
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Primarily the Milky Way galaxy is made of dust,
gas and stars
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Using the 21cm line radiation of neutral (cool)
hydrogen gas that makes up a significant fraction
of the milky way we can map out the spiral
structure of our galaxy and locate the Sun's
position within the spiral arms.
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There are 10,000,000,000 stars in the Milky Way
Infrared View of the Milky Way
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Hot Gas in the Milky Way