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SlideshowReport

Compression Wave in Traffic Flow

Description
Compression Wave in Traffic Flow
When normal traffic flow is slowed down, cars bunch together. In a grand-design
galaxy, a density wave moves through the stars and gas. The wave is merely a
region of slightly denser matter, which, in turn, creates more gravitational force.
This force compresses the gas and enhances star formation, which highlights
the spiral density wave
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