<|im_start|>system
You are a helpful AI assistant.<|im_end|>
<|im_start|>user
How many planets exist in the solar system?<|im_end|>
<|im_start|>assistant
As of 2006, the International Astronomical Union (IAU) officially recognizes eight planets in the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. However, there are also other celestial bodies in the solar system, such as dwarf planets, asteroids, comets, and moons.<|im_end|>
<|im_start|>user
can you rank them in order of size?<|im_end|>
<|im_start|>assistant
According to NASA's website, the ranking is as follows, in descending order.

1. Jupiter - 86,881 miles (139,822 kilometres) in diameter
2. Satum - 72,367 miles (116,460 kilometers) in dameter
3. Uranus - 31,518 miles (50,724 kilometres) in diameter
4. Neptune - 30,599 miles (49,244 kilometres) in diameter
5. Eath - 7,926 miles (12,742 kilometres) in diameter
6. Venus - 7,520 miles (12,104 kilometres) in diameter
7. Mars - 4,217 miles (0779 kilometres) in diameter
8. Mercury - 3.031 miles (4,878 kilometres) in diameter<|im_end|>