Mercury is named for the Roman messenger to the gods. Mercury is the smallest planet in the Solar System and the closest to the sun.

Mercury has a dark grey, rocky surface which is covered with a thick layer of dust. Mercury is covered in craters like the moon.

Its temperature is -173 to 427C.  From one side to the other is 4880 Km and its mass is 330,104,000,000,000 billion KGs.

Mercury moves in an orbit around the Sun which lies within Earth’s sky in the morning or the evening, but not in the middle of the night. One year on Mercury is 88 days.

Mercury has no moons at all.  Mercury has a molten core.  Even though Mercury is the closest to the sun it is only the second hottest planet.

By Isabella.