Simplify the following text for a Grade 8 native English-speaking person.
Original: At perihelion ( closest approach to the Sun ) , it moves closer to the Sun than Uranus , while at aphelion ( farthest approach to the Sun ) it goes even farther thanNeptune .
Simplified: At perihelion , it moves much closer to the Sun than Uranus , while at aphelion it moves out well beyond the orbit of Neptune .