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