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In this video I will explain the three (2 main) factors determining if a planet has an atmosphere. The 2 main factors are 1) temperature (affects the speed of the molecules in the atmosphere.), 2) gravity (affects the “pull” the planet has on the molecules in the atmosphere), and the third factor is 3) magnetic field (protects the planet from solar winds).

Next video in this series can be seen at:
https://youtu.be/yHyfBlKw_uw