Astronomers determine the distribution of matter in the Milky Way using a <1>. This is a graph of orbital velocity versus <2> and includes many stars in the Milky Way. The large values of velocity for the center of the Milky Way indicate the presence of <3>. The <4> values of velocity for the outskirts of the Milky Way indicate the presense of dark matter. The suggestion that dark matter consists of white dwarfs is classified as a <5> theory, while the suggestion that it is made of exotic subatomic particles is a <6> theory.
Spiral Arms are explained by the Density Wave Theory which states that the spiral arms are analogous to <7>. When faster moving clouds of gas pass through a spiral arm, they are compressed which triggers star formation. We see the spiral arms because <8> stars which form there don't live long enough to leave. The sun is presently located in a spiral arm becuase <9>.
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Spiral Arms are explained by the Density Wave Theory which states that the spiral arms are analogous to <7>. When faster moving clouds of gas pass through a spiral arm, they are compressed which triggers star formation. We see the spiral arms because <8> stars which form there don't live long enough to leave. The sun is presently located in a spiral arm becuase <9>.
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