Jupiter has a radius of 69,911 km, and the diameter of it is 142,984 km. The circumference of Jupiter is 439,264 km. The overall structure of Jupiter on the inside is liquid/metallic hydrogen while the outer layer is made out of molecular hydrogen. The universe is 14 billion years old. A few facts about earth are: Earth is 4.543 billion years old, and in 2013 the population was 7.125 billion people. Also did you know that 1.3 million earth's could fit into the sun?