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| abstraction > hypothesis > theory > astronomy theory > galaxy theory > density wave theory |
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| density wave theory comparison table | ||||
| Subject | has author | is a kind of | has implication | has definition |
|---|---|---|---|---|
| galaxy theory | or reasearch group | astronomy theory | ||
| density wave theory | Lindblad (1925) | galaxy theory | the density waves rotate more slowly than the galaxy's stars and gas | Spiral structure is modelled as a small-amplitude wave propagating with fixed angular velocity, as the compression wave goes through, it triggers star formation on the leading edge of the spiral arms. |
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