With daytime temperatures that can reach 430C, why is nighttime ...

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With daytime temperatures that can reach 430C, why is nighttime on Mercury so cold?
 
  A) Because the year is so short, there isn't enough time for the heat to build up in the equatorial regions.
  B) With very little atmosphere, heat is quickly lost back into space.
  C) The weak gravitational field doesn't retain the daytime's heat.
  D) The solar winds quickly dissipate all heat on the planet's dark side.

Question 2

As you read these words, the Sun is
 
  A) gaining mass.
  B) losing mass.
  C) neither gaining nor losing mass.
  D) None of the above.

[zhanghao]

Answer to Question 1

Answer: B

Answer to Question 2

Answer: B