- Mercury is the first (1st) planet from the Sun. It is not very easy to observe since it is always close to the Sun in the sky. 

- The planet revolves around the Sun once every 88 days. 

- Mercury is a small, rocky planet.

- Mercury is very similar to the Moon. Its surface is covered with craters. It has no atmosphere and no water.

- During the day, the temperature can reach up to 450°C but the nights are very cold, below -180°C. 

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