Mercury

Mercury is the first planet in the Solar System. Because it is in the star system, of course, it orbits the Sun. Compared to the other planets, it is quite unique due to its thin atmosphere. It is smaller than few of the largest moons in the Solar System. It has the biggest temperature range, available to increase over 1,000 F in the daytime than nighttime. It is the smallest terrestrial planet and is 3,032 mi in diameter.

Hot and Cold
The daytime on Mercury grows 800 F, this is enough to melt lead! Can you believe that temperature? However, in the nighttime, the temperature climbs down to -290 F! The gas giant planets and some of their moons have this average temperature! It has the biggest temperature increase of all the bodies in the Solar System.

Craters
Craters are made from meteorites and asteroids. There are many because it has a very thin atmosphere. Mercury has 397 named craters as of 2017. Caloris Basin is the largest crater on the rocky planet. It is 1,560 km (960 mi) in diameter.