In the early 1800s, no one knew that the planet Neptune existed. Most people believed that our solar system was made up of the sun, seven planets, and several moons. But astronomers—scientists who study objects in outer space—were not so sure. The astronomers thought that at least one other planet might be orbiting (traveling around) the sun. They
had been studying the distant planet Uranus. And what they saw was very odd...

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