human
What are some of the most interesting facts about the planet Mars?
assistant
1. Mars is the fourth planet from the sun and has two moons, Phobos and Deimos.
2. Mars has a thin atmosphere composed primarily of carbon dioxide, with small amounts of nitrogen, argon, oxygen, water vapor, and other gases.
3. Mars has an average temperature of -63 degrees Celsius (-81 Fahrenheit).
4. The surface of Mars is marked by canyons, volcanoes, and craters.
5. Mars has been explored by spacecraft since the 1960s.