- Mercury is the closest planet to the Sun only 58 million km (36 million miles).
- Temperature on Mercury varies more than any other planet.
- Mercury is named for the Roman messenger to the gods.
- Its orbital speed is 172,294 km (107,082 mile) per hour.
- Mercury has a diameter of 4,879 km (3032 miles) making it the smallest planet.
- A year on Mercury takes 88 Earth days.
- A day on the surface of Mercury lasts 59 Earth days.
- Your weight on Mercury would be 38% of your weight on Earth.
- Temperature range 450 degrees to minus 170.
- The surface of Mercury is very similar to our moon. It has a very barren, rocky surface covered with many craters.
