The largest planet in our solar system is Jupiter.

Jupiter is the largest planet in our solar system and is known as a gas giant. It is the fifth planet from the Sun and is located between Mars and Saturn. Jupiter is named after the Roman king of gods and sky.

Size and Composition:
Jupiter has a diameter of about 143,000 kilometers, making it more than 11 times larger than Earth. It is so massive that it contains more than twice the combined mass of all the other planets in our solar system.

Jupiter is mostly composed of hydrogen and helium, similar to the composition of the Sun. It does not have a solid surface like Earth, but rather a dense atmosphere that gradually transitions into a liquid and then into a gaseous state as you go deeper into the planet.

Distinct Features:
Jupiter is known for its iconic feature, the Great Red Spot. This is a massive storm that has been raging on the planet for hundreds of years. It is so large that it could fit multiple Earths within its boundaries.

Jupiter also has a strong magnetic field that is about 20,000 times stronger than Earth's. This magnetic field generates intense radiation belts around the planet, making it a dangerous environment for spacecraft.

Moons:
Jupiter has a system of moons, with the four largest moons known as the Galilean moons. These moons were discovered by Galileo Galilei in 1610 and are named Io, Europa, Ganymede, and Callisto. Ganymede, the largest moon in the solar system, is even bigger than the planet Mercury.

Importance:
Studying Jupiter is important because it provides valuable insights into the formation and evolution of our solar system. The planet's immense size and gravity have a significant influence on the dynamics of the solar system, and its magnetic field and radiation belts help us understand similar phenomena in other planetary systems.

In conclusion, Jupiter is the largest planet in our solar system. Its immense size, distinct features like the Great Red Spot, and system of moons make it a fascinating object of study.