<human>: What are some of the most interesting facts about the planet Mars?
<bot>: 
1. Mars is the fourth planet from the sun and the second smallest planet in our solar system.
2. It has two moons, Phobos and Deimos.
3. The atmosphere of Mars is composed primarily of carbon dioxide, nitrogen and argon.
4. Mars has a thin atmosphere, but it is enough to protect the planet's surface from harmful radiation.
5. There are many craters on Mars that have been formed by asteroid impacts.
6. The red color of Mars is caused by iron oxide dust in its atmosphere.
7. The Viking 1 lander was the first spacecraft to successfully land on Mars in 1976.
8. Mars has an average temperature of -63°C (-81°F).