Multiple choice

Which is the lightest planet?

  1. Mars

  2. Jupiter

  3. Earth

  4. Mercury
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mercury is the lightest planet in our solar system, with a mass of only about 0.055 Earth masses. It's the smallest planet and the closest to the Sun. Mars, Jupiter, and Earth are all significantly more massive.

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