Substances Jupiter is basically a big ball of pure substances like hydrogen and helium. Jupiter's alloies has a mixture of gases which has made it hard to explore. Jupiter is one of the four gas giants in our solar system. The others are Saturn, Uranus, and Neptune.The gases of Jupiter are mostly hydrogen and helium. These gases mix with small amounts of water, methane and ammonia to form a large layer that surrounds the planet. Under this layer is a layer comprised of liquid hydrogen, which is an effect of the strong.pressure that Jupiter generates. Below is another layer of liquid and metallic hydrogen, which surrounds a core made up of iron and rock.Our planets were formed out of the solar nebula 4.5 billion years ago. A nebula is a huge cloud of hydrogen, dust, and other elements, which, because of gravity, begins to close in on itself. As this happens, particles of dust and hydrogen collide and start to stick together. As their gravity increases, they collect more material and get bigger. we got this from What Is Jupiter Made Of?