MERCURY IS THE SMALLEST OF ALL THE PLANETS IN THE SOLAR SYSTEM. MERCURY ORBITS CLOSEST TO THE SUN,AT AN AVERAGE DISTANCE OF APPROXIMATELY 58 MILLION KM.
THE PLANETS DIAMETER IS 4 879KM (3 032 MI), AND ITS VOLUME AND MASS ARE ABOUT ONE-EIGHTEENTH THAT OF EARTH. MERCURY`S MEAN DENSITY, 5.4 g/ cm3, IS NEARLY AS GREAT AS THAT OF EARTH AN IS HIGHER THAN THAT OF ANY OF THE OTHER PLANETS. THE FORCE OF GRAVITY ON THE PLANET`S SURFACE IS ABOUT ONE-THIRD OF THAT ON EARTH SURFACE OR ABOUT TWICE THE SURFACE GRAVITY ON THE MOON. MERCURY HAS NO MOONS OF ITS OWN
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