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Author Question: A star on the upper edge of the main sequence denotes that: A) it has exhausted nearly all ... (Read 82 times)

torybrooks

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on: Jul 27, 2018
A star on the upper edge of the main sequence denotes that:
 
  A) it has exhausted nearly all hydrogen in its center.
  B) it has reached stability for the first time.
  C) it is in the zero-age main sequence.
  D) it is converted into a brown dwarf.

Question 2

Which of the following statements is true of interstellar dust?
 
  A) It makes up about 10 percent of the mass of the interstellar medium.
  B) The average size of particles of interstellar dust is 1 micrometer.
  C) It is made mostly of carbon and silicates mixed with frozen water.
  D) It is uniformly distributed through space.


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pallen55

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

A

Answer to Question 2

C


torybrooks

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Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

xiaomengxian

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Reply 3 on: Yesterday
Excellent

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