Practice questions for the Sun and the Stars pt2

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Author:
dwrght16
ID:
302107
Filename:
Practice questions for the Sun and the Stars pt2
Updated:
2015-05-04 16:51:38
Tags:
Practice questions Sun Stars pt2
Folders:
astro
Description:
final exam
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  1. The source of energy that keeps the Sun shining today is
    nuclear fusion
  2. Which of these layers of the Sun is coolest?
    photosphere
  3. This X-ray image shows a loop of hot gas above the surface of the Sun. Surface features on the Sun like these are what kind of phenomena?
    magnetic
  4. This figure represents the equilibrium achieved in a star between a pull inward and a push outward.  What causes these pushes and pulls?
    The pull inward is due to gravity and the push outward is due to a radiation pressure from fusion.
  5. Why is a star's birth mass its most fundamental property?
    A star's birth mass is the most important predictor of a star's lifetime. A star born with high mass will have a short lifespan; a star born with low mass will have a significantly longer lifespan.
  6. How is the lifetime of a star related to its mass?
    More massive stars live much shorter lives than less massive stars.
  7. What is the common trait of all main-sequence stars?
    They generate energy through hydrogen fusion in their core.
  8. After a star runs out of Hydrogen fuel in the core, in order to fuse Helium what must happen first?
    gravity must shrink the star and raise the core temperature

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