Multiple choice general knowledge science & technology

In scientific terms, what is a “blue moon”?

  1. The moon as it appears on a very cold and cloudy night

  2. Something that never occurs

  3. The second full moon that occurs in the same month

  4. A full moon covered in blue moon dust
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A blue moon is the second full moon occurring within a single calendar month. This happens approximately every 2-3 years because the lunar cycle is about 29.5 days, shorter than most months. The phrase 'once in a blue moon' refers to this rarity. It has nothing to do with the moon's actual color, temperature, or never occurring.

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