Mercury is the planet closest to the Sun. It has no atmosphere, so it has a large temperature range. It is the smallest terrestrial planet in the solar system, it's so small, that Titan and Ganymede exceed it in size.
Like Venus, Mercury has no moons.
Mercury was discovered by ancient astronomers thousands of years ago. It was named after the Roman god of messengers, Mercury.
So far only two satellites have explored Mercury, Mariner 10, and MESSENGER.
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- It has many craters on its surface because it doesn't have an atmosphere to stop asteroids from crashing into it.
- Mercury is a terrestrial planet.