1. What are three different ways a giant molecular cloud can be triggered to con

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1. What are three different ways a giant molecular cloud can be triggered to contract?
2. How does the energy transport differ from a high-mass star to that of a low-mass star like the Sun?
3. If we could see in infrared light, what would a clear night sky look like? Are we missing out by being able to see only in visible light? Hint: Think about views in and near the Milky Way versus far away from the Milky Way.
4. Why is there a lower end of mass to the main sequence? Why is there an upper end? Refer to Chapter 12. Hint: What happens if a star is too big or too small?
5. Why does the main sequence appear as a band and not just the ZAMS line? Also, how do you know that the helium flash occurs if the flash cannot be observed? Can you accept an event as real if you can never observe it? Hint: How likely is it that the event be large enough and last long enough to view from Earth?
6. Is fusion of the lightest element in the core of a very massive star in the center, in the innermost shell, in an inner shell, in an outer shell, or in the outermost shell? What about the heaviest element?
7. What might Earth’s day and night look like from Earth’s surface when the Sun becomes a white dwarf? Would Earth’s day be as bright? Would we still see phases of the Moon? Hint: Refer to the H-R diagram

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