Space for a 7-year-old — 3 simple rephrasings of a solar system sentence

Here are three simple ways to say your sentence for a 7-year-old:

1. Space is very big. Our solar system is inside it. The Sun sits in the middle and eight planets — Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune — move around it.
2. Think of space as a giant place. Inside it is our solar system, with the Sun at the center. Eight planets — Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune — orbit the Sun.
3. Space is enormous. Inside space is our solar system. The Sun is in the center, and eight planets circle around it: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Why these work for a 7-year-old: They use short sentences and simple words (like "big," "move," and "circle") so the idea is easy to understand, while keeping the correct planet names and the main idea that the Sun is in the middle.