Multiple choice general knowledge

What is a "blue moon"?

  1. A full moon that is not timed in the regular monthly pattern

  2. The moon as seen from under the ocean

  3. A common occurrence

  4. All of these are correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A blue moon refers to an extra full moon that occurs when a calendar month or season has two full moons instead of the usual one. It is a rare astronomical event, not a common occurrence or an optical illusion from viewing underwater.

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