Mercury

─ Mercury is the smallest planet in our solar system. It’s a little bigger than Earth’s Moon. It is the closest planet to the Sun, but it’s actually not the hottest. Venus is hotter.

─ It has a thin atmosphere, and doesn’t have any moons. Mercury likes to keep things simple.

─ If you weigh 45 kg (100 pounds) on Earth, you would weigh 17 kg (38 pounds) on Mercury.