Multiple choice general knowledge science & technology

What is the aurora borialis' rarest color?

  1. Blue

  2. Red

  3. Green

  4. Purple
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Red is indeed the rarest aurora color. Most auroras appear green (from oxygen at lower altitudes) or pink/purple (from nitrogen at higher altitudes). Red auroras, produced by oxygen at very high altitudes (above 150 miles), are much less commonly seen and require specific solar activity conditions.

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