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Author Question: Why has star formation ceased in the galactic halo? A) The halo has no gas at all. B) There are ... (Read 242 times)

big1devin

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on: Jul 27, 2018
Why has star formation ceased in the galactic halo?
 
  A) The halo has no gas at all.
  B) There are no white dwarf binaries to trigger star formation via their supernovae.
  C) All the halo gas consists of elements with more protons than helium.
  D) All of the galaxy's cool gas settled to the galactic plane long ago.

Question 2

How are elements heavier than iron made? Why are they rare?
 
  What will be an ideal response?


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honnalora

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Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

The elements heavier than iron are formed when protons and neutrons are crammed into nuclei making up the outer layers of massive stars as those layers are hurled into the interstellar medium during a supernova event. These conditions do not last long, so there is very little time for the creation of these elements.


big1devin

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Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


honnalora

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Reply #3 on: Jul 27, 2018
Great! Please up vote :D


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