I create light during the night, my face changes every month, and I'm often full of mystery. What am I?

Category: Science · Difficulty: medium

Hint: Consider something visible in the sky that shifts over time.

Answer

A moon phase

Explanation

A moon phase refers to the observable shape of the moon as it waxes and wanes.

This is a medium science riddle — a moderate challenge for most people. The answer is A moon phase.

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