Fact 1: Aplanet rotating causes cycles of day and night on that planet.

Fact 2: Rotation determines day and night, and the length of the day.

Given the two facts above, answer the question "What causes night on a planet?" with the following options: 
- clouds
 - speed
 - Winter
 - rotation
 - Solar energy
 - axis
 - heat energy
 - wind


 

    rotation     