The Leading Explanation for the Existence of Spiral Arms Is

question 58

Multiple Choice

The leading explanation for the existence of spiral arms is

• A) shock waves from cyclic supernovae explosions.
• B) shock wave from the quasar-like eruption of the Galactic core.
• C) passages of spiral density waves through the interstellar medium.
• D) passages of massive globular clusters through the Galactic plane.
• E) tidal streams of small galaxies being torn up by our monster Galaxy.

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