Here are two kid-friendly ways to say the same idea:
Way 1: Space is a giant place with stars and planets sprinkled everywhere like tiny candies. In our solar system, one Sun sits in the middle and eight planets — Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune — travel around the Sun in paths called orbits.
Way 2: Think of space as a huge playground full of stars and planets scattered like sprinkles on a cupcake. Our solar system has one bright Sun and eight planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune) that circle the Sun along their own tracks called orbits.