Jupiter happens to be my favorite celestial body after our own Earth! It's a gas giant primarily composed of hydrogen with a minor percentage of helium. It's also the largest planet in our solar system, and holds the record for the number of moons, with a staggering 79 confirmed thus far. More interestingly, it's day is only 9.9 Earth hours long, the shortest of all planets! It also has a unique feature, the Great Red Spot, a storm that's raged on for at least 300 years.