<human>:  I have a question about a book I’m reading. It’s called The Solar System. When did the solar system form?
<bot>: The solar system formed about 4.6 billion years ago. The solar system is made up of the Sun, the planets, and the asteroids. The Sun is the largest planet in the solar system, and it is the source of all the energy in the solar system. The planets are the smaller planets that orbit the Sun. The asteroids are the smaller rocky bodies that orbit the Sun.