1. Jupiter: Jupiter is the largest planet in the Solar System, with a diameter of approximately 142,984 kilometers (88,846 miles) and a mass that is 318 times that of Earth. It is a gas giant composed primarily of hydrogen and helium, and has a powerful magnetic field that generates intense radiation belts. Jupiter is known for its prominent Great Red Spot, a massive storm that has been raging for at least 300 years.

2. Saturn: Saturn is the second largest planet in the Solar System, with a diameter of approximately 116,464 kilometers (72,367 miles) and a mass that is 95 times that of Earth. It is also a gas giant primarily composed of hydrogen and helium, and is renowned for its extensive and distinctive ring system. Saturn has numerous moons, with its largest moon, Titan, being larger than the planet Mercury.

3. Uranus: Uranus is the third largest planet in the Solar System, with a diameter of approximately 51,118 kilometers (31,763 miles) and a mass that is 14.5 times that of Earth. It is an ice giant, composed primarily of hydrogen, helium, water, methane, and ammonia. Uranus has a unique rotation axis that causes it to "roll" on its side as it orbits the Sun.

4. Neptune: Neptune is the fourth largest planet in the Solar System, with a diameter of approximately 49,244 kilometers (30,599 miles) and a mass that is 17.1 times that of Earth. It is also an ice giant, though slightly smaller than Uranus, and is composed primarily of hydrogen, helium, water, methane, and ammonia. Neptune has several large moons, including Triton, which has a retrograde orbit around the planet.