Our solar system is the Sun and everything that orbits it. The Sun is huge — it's a star. The eight planets all spin around it, each in its own giant circle (called an orbit).
If the Sun were a beach ball, the Earth would be the size of a pea — and it would be 24 metres away. Most of space is empty space.
The Sun is so big that 1.3 million Earths could fit inside it. And the Sun is just an average-sized star. Some are 1,000 times bigger.
Earth is the only planet we know of that has life. Out of every place in our solar system — boiling Mercury, freezing Neptune, the giant gassy Jupiter — only this one round, blue, watery, mostly-mild ball has trees, animals, you, and Tết.
Look after it.