King of the Planets
Jupiter is the fifth planet from our sun. It is named for the king of ancient Roman gods. It is the biggest planet in our solar system. More than 1,300 Earths could fit inside it.
WHAT'S IT LIKE ON JUPITER?
Jupiter's stripes and swirls are cold, windy clouds of ammonia and water. Jupiter's Great Red Spot is a giant storm as wide as three Earths. This storm has lasted hundreds of years. Jupiter's atmosphere is poisonous. It is mostly hydrogen and helium. Jupiter gets very hot and very cold. There is dangerous radiation, too. Talk about bad weather.
Scientists think Jupiter's core may be a thick, super hot soup. It might be up to 50,000 degrees Fahrenheit (27,760 degrees Celsius) down there.
Jupiter has its own "mini solar system" of 50 moons. Scientists are most interested in the Galilean satellites -- the four largest moons discovered by Galileo Galilei in 1610. Europa, may have an ocean under its frozen surface. Callisto's crater-pocked landscape may be the oldest in the solar system. Ganymede is the solar system's largest moon. It is bigger than Pluto and Mercury. And little Io has more volcanoes than anyplace else in the solar system.
Jupiter also has three rings, but they are very hard to see and not nearly as pretty as Saturn's.