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Mercury has no seasons
Seasons on planets are influenced by axial tilt and variable distance from the sun. Mercury’s axis of rotation is tilted at 2 degrees. It means that the planet spins nearly perfectly upright and so there is no way it can experience seasons as other planets do. In comparison, Earth has a 23.4 degrees axis of rotation tilt. So as it zips around the sun, the seasons come about depending on which side faces or is away from the sun.
