Ancient people believed that there were five planets. They knew about Venus, Mars, Jupiter, Saturn, and Mercury.
Astronomers are scientists who study the planets. Our solar system is made up of nine planets that revolve around a big star called the Sun.
Some of the most famous astronomers were Copernicus, Brahe, Kepler, Galileo and Newton.
We are astronomers because we have studied the planets and stars. Join us and learn about the planets, about orbit, and about other solar system facts. We hope you enjoy being an astronomer, too!