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.

Question

Quizplus · Accepted Answer

Over the course of 500 million years, we would expect to see stars moving through the spiral arms, bunching up as they travel through the arms. We would also expect to see young hot stars forming and dying within the arms before moving out. This is because the density of gas and dust within the spiral arms provides an ideal environment for star formation. The other choices (A, B, and D) are not accurate descriptions of what we would expect to see happen over this time frame.

If We Could Watch Spiral Arms from a Telescope Situated