With daytime temperatures that can reach 430°C, 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.
Answer: B
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