MERCURY IS THE CLOSEST PLANET TO THE SUN. IT LOOKS SIMILAR TO THE MOON IN APPEARANCE WITH A LOT OF CRATERS. MERCURY HAS A THIN LAYER OF ATMOSPHERE CONSISTING OF ATOMS WHICH GET BLASTED OFF THE PLANET BY SOLAR WINDS BECAUSE THE PLANET IS SO HOT. THE ATMOSPHERE IS CONSTANTLY BEING REPLENISHED. MERCURY HAS NO MOONS , AND ITS MAGNETIC FIELD IS ABOUT 1% THAT OF EARTH. ITS DENSITY IS SECOND TO EARTH BECAUSE OF ITS LARGE IRON CORE.
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