Jupiter and its Galilean Satellites Jupiter Orbit: 778,330,000 km (5.20 AU) from Sun Diameter: 142,984 km (equatorial) Mass: 1.900e27 kg Jupiter is the fourth brightest object in the night sky and is also the biggest planet in our solar system. In fact it's so big you can put 100 Earths around it. One of the main reasons it is so big is the volume of its gases, which are 90 percent hydrogen, and 10 percent helium and traces of methane, water, …
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…Diameter: 3138 km Mass: 4.80e22 k Callisto is the most heavily cratered object in the solar system. Craters almost cover every part of its surface. It is about 40 percent ice and 60 percent rock and iron. Some small craters have been mostly obliterated. It also may have a very weak magnetic field. Callisto has the oldest of any body yet observed in the solar system. One of the biggest craters Valhalla, which is nearly 3000 kilometers in diameter. .