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Author Question: One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s . ... (Read 45 times)

SAVANNAHHOOPER23

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on: Jul 27, 2018
One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s . How far is 1 light-year?
 
  A) 1.08 billion km (1,080,000,000, or 1.08  109 km)
  B) 300 thousand km (300,000, or 3  105 km)
  C) 9.46 trillion km (9,460,000,000,000, or 9.46  1012 km)
  D) 18 million km (18,000,000, or 1.8  107 km)

Question 2

What eventually halts the gravitational collapse of an interstellar gas cloud that forms an object that is massive enough to become a star?
 
  A) the central object becoming hot enough to sustain nuclear fusion in its core
  B) a critical fraction of the gas has been driven further into space
  C) nothing; all collapsing gas clouds become black holes
  D) the crowding of electrons in the core


dawsa925

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

C

Answer to Question 2

A


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SAVANNAHHOOPER23

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


dawsa925

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


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