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The sun is the center of our solar system. It is a star. Its strong gravity keeps planets and moons around it. Gravity is a force that pulls. Jupiter is pulled into orbit around the sun. An orbit is a rounded path that one object follows around another.

In 1610, Galileo Galilei discovered four of Jupiter’s moons. He saw them through his telescope. He thought they were stars. But after watching them closely for a while, he saw they moved. They also stayed close to Jupiter. Galileo realized they were moons.

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Making Connections


If you were a scientist, which planet would you want to send a spacecraft to? Why would you choose that one?


Have you read other books about planets? How are those planets similar to or different from Jupiter?


Jupiter’s Great Red Spot is a giant storm. Can you think of some kinds of storms that happen on Earth?

Teacher Resources

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