Author Question: Most of the atoms in the universe are thought to be A) hydrogen. B) helium. C) about equal ... (Read 146 times)

D2AR0N

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Most of the atoms in the universe are thought to be
 
  A) hydrogen.
  B) helium.
  C) about equal amounts of hydrogen and helium.
  D) iron.
  E) elements unknown at present.

Question 2

What event marks the birth of a star, and what event marks its death?
 
  What will be an ideal response?



leeeep

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Answer to Question 1

Answer: A

Answer to Question 2

Answer: A stellar body becomes a star when thermonuclear fusion is ignited in its core. Death occurs when its nuclear fires go outwhen nuclear fusion ceases.



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leeeep

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