What best explains the darkness of the rings beyond Saturn's? ...

[pepyto]

What best explains the darkness of the rings beyond Saturn's?
 
  A) Water ice reflects light poorly at the low temperatures beyond Saturn.
  B) Old, sooty debris and radiation darkening.
  C) Rocky debris doesn't reflect as well as water ice.
  D) They are pieces of captured comets.
  E) The sunlight is much fainter out there.

Question 2

The proton-proton chain is ________.
 
  A) another name for the force that holds protons together in atomic nuclei
  B) the linkage of numerous protons into long chains
  C) the specific set of nuclear reactions through which the Sun fuses hydrogen into helium
  D) an alternative way of generating energy that is different from the fusion of hydrogen into helium

[xthemafja]

Answer to Question 1

B

Answer to Question 2

C

[pepyto]

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[xthemafja]

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