We look at the stars and space with tools like telescopes. We learn about stars and planets by watching them. Different tools help us see different kinds of light. Some tools see the kind of light that our radios use. Other tools see heat light which is invisible to our eyes. We use special telescopes in space to see better. A long time ago, a man named Galileo used a telescope to look at the stars for the first time. We have been learning more about space ever since then.

In our Solar System, there are planets and smaller planets called dwarf planets. Many of them have moons. Moons are like very small planets that go around the bigger ones. Some moons are very big and round. They could be dwarf planets if they were not going around other planets. Moons move around their planets in two ways. "Regular" moons move the same way their planet turns. "Irregular" moons move differently, and some of them were not always part of the Solar System. A long time ago, a man named Galileo found four moons around Jupiter. For many years, only a few moons were known. But when people sent spaceships to look around in the 1970s, they found more moons. And now, by looking through big telescopes, people have found even more moons. The very small planet closest to the sun, Mercury, does not have any moons that we can see. Venus, which is next to Mercury, also does not have moons. Our Earth has one big moon, and it is the biggest moon for a planet like ours.

Scott Sheppard is a man who looks at stars and planets. He works in Washington, DC. He went to school and learned a lot about space. He found many small moons and some planets very far away. He also found a special rock in space named after him. It is called 17898 Scottsheppard. Scott found the farthest object that goes around the Sun. It is called 2012 VP113, but some people call it Biden. He thinks there might be a big hidden planet very far away. This planet makes other space rocks move in a special way. Scott and his friends are still looking for more clues about this big planet.