Multiple choice general knowledge science & technology

Which planet has no atmosphere?

  1. Mars

  2. Mercury

  3. Uranus

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

Mercury has only an extremely thin exosphere with minimal atmospheric pressure, not a true atmosphere. The surface pressure is about 10^-15 bar, essentially a vacuum compared to other planets. Mars has a thin but substantial CO2 atmosphere, while Uranus and Venus have thick atmospheres.

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