What are the distinguishing features of the planet Mercury?

The planet Mercury is the smallest planet in the Solar System and is closest to the Sun. It is named after Mercury, the messenger of the gods in Roman mythology. The distinguishing features of the planet Mercury include:

• It has a heavily cratered surface with features such as valleys, cliffs, and craters.
• It has a very thin atmosphere which is composed mostly of helium and sodium.
• It has a large metallic core which makes up about 60% of its mass.
• It has a slow rotation and completes three rotations around its axis for every two orbits it makes around the Sun.
• It has extreme temperature variations between its daytime and nighttime due to its lack of atmosphere.

Overall, these features make Mercury a unique planet in the Solar System and an interesting subject of study for astronomers and space enthusiasts.