One key difference between the inner planets and outer planets is their composition. The inner planets, Mercury, Venus, Earth, and Mars, are small, rocky, and have solid surfaces. In contrast, the outer planets, Jupiter, Saturn, Uranus, and Neptune, are much larger and composed mostly of gas and ice.
Another difference is their distance from the sun. Inner planets are closer to the sun and therefore have shorter orbital periods, while the outer planets are farther away and have longer orbital periods.
The outer planets are also known for having more moons and rings, while the inner planets have few or none.
Finally, the outer planets are generally much colder than the inner planets due to their distance from the sun, which affects their temperatures and weather patterns.