Which of the Following Models Best Explains Why Our Galaxy

question 51

Multiple Choice

Which of the following models best explains why our galaxy has spiral arms?

• A)The spiral arms are a wave of star formation caused by wave of density propagating outward through the disk of the galaxy.
• B)No model can explain the existence of the arms, which rotate with the galaxy like the fins of a giant pinwheel toy.
• C)The spiral arms were imprinted on the galaxy at its birth. Ever since, like a coiling rope, the spiral arms have been wound tighter with each galactic rotation.
• D)The spiral arms are composed of groups of stars that are bound together by gravity and therefore always stay together as the galaxy rotates.

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