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 29.5 days while most months are 30-31 days. Options A, B, and D are incorrect - it's not about cold/cloudy nights (A), has no relation to rarity meaning 'never' (B), and there's no such thing as 'blue moon dust' (D).

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