Jupiter is a gas giant planet composed mostly of hydrogen and helium. It has a rocky core, metallic hydrogen, an ocean of liquid hydrogen and helium, and an atmosphere of hydrogen, helium, ammonia, and water. The planets gases haven’t changed in four billion years, so studying its composition is a way to investigate our solar system’s history. Jupiters core is believed to be a dense core of heavy elements that formed during the early solar system. The solid core of ice, rock, and metal grew from a nearby collection of debris, icy material, and other small objects such as comets and asteroids that were zipping around four billion years ago. The planets atmosphere is predominantly hydrogen, with the remaining 10% being almost entirely helium, though there are small traces of other gases inside. Jupiters atmosphere has three layers made of ammonia ice, ammonium hydrosulfide crystals, and water ice and vapor. Jupiters ocean is made of liquified hydrogen and helium instead of water.