Jupiter is the biggest planet in our Solar System.    It is the largest by mass, volume, and surface area among other  statistics. Here are the critical measurements o … f Jupiter as well  as a few other interesting facts about the planet and other bodies  in the Jovian system.he largest planet in our solar system is Jupiter. is 90,000 miles(140,000 km) in diameter. One day on Jupiter is 9 hours and 25 minutes long and a year is 12 Earth years long … because it is so big but it's Jupiter is very quick specially for Jupiter.