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Exploring Space

Mercury's Basic Facts

Meteors, Asteroids, & Comets
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  • closest planet to the sun
  • rocky planet
  • days are 58.65 Earth days
  • smallest planet in our solar system, but it used to be the 2nd smallest planet when Pluto was considered a planet
  • 3,031 miles in diameter
  • mass is about 3.3 x 1023 kg
  • gravity on Mercury is 38%
  • orbit:57,910,000 km (0.38 AU)
  • Temperatures: −180 to 430C or 292 to 806F

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