What is the largest planet in our solar system?

Jupiter is the largest planet in our solar system, and it significantly outweighs all the other planets. With a diameter of about 86,881 miles (139,822 kilometers) and a mass more than 300 times that of Earth, Jupiter's immense size and mass make it a gas giant primarily composed of hydrogen and helium. Its great gravity allows it to have a robust atmosphere and a large number of moons, as well as a prominent ring system, though they are not as visible as those of Saturn.

The characteristics and scale of Jupiter also allow it to have a strong magnetic field and numerous unique features, such as the Great Red Spot, a gigantic storm that has been observed for centuries. In contrast, planets like Mars and Earth are much smaller, and Saturn, while large, is still less massive than Jupiter. Jupiter's position as the giant of our solar system is well-established both through observational and mathematical evidence in astronomy.