If We Could Watch Spiral Arms from a Telescope Situated

question 93

Multiple Choice

If we could watch spiral arms from a telescope situated above the Milky Way over 500 million years,what would we see happen?

• A)The spiral arms will seem to "wind up," to wrap more and more tightly around the center of the Galaxy.
• B)The spiral arms will eventually dissipate and fade away,since they are a temporary phenomenon that should only last for a million years or so.
• C)Stars will move through the spiral arms,bunching up closer as they pass through.Young hot stars will form and die within the arms before having a chance to move out.
• D)The spiral arms will eventually unwind,as centripetal forces send the stars flying outwards into intergalactic space.

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