Auroras exist on other planets, too. Which one of these does NOT have them?

The Question: Auroras exist on other planets, too. Which one of these does NOT have them?

A Venus
B Saturn
C Mercury

Due to its small size and proximity to the sun, Mercury doesn’t have an atmosphere. And without an atmosphere, there can be no auroras. Mars, Venus, Saturn, Jupiter, and Uranus have all been observed to have auroras, though.

The correct answer is Mercury.

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