The solar system is made up of the Sun, the planets that orbit the Sun, their satellites, dwarf planets and many, many small objects, like asteroids and comets. All of these objects move and we can see these movements. We notice the Sun rises in the eastern sky in the morning and sets in the western sky in the evening. We observe different stars in the sky at different times of the year. When ancient people made these observations, they imagined that the sky was actually moving while the Earth stood still.The Moon is a natural satellite of the Earth, meaning that it orbits around the Earth.

It is the only place outside of the Earth that humans have ever been! We can often see the Moon on a clear night, but it does appear to change shape during the 29 days it takes to orbit the Earth.