Simplify the following text for a Grade 10 native English-speaking person.
Original: A trans-Neptunian object ( TNO ; also written transneptunian object ) is any minor planet in the Solar System that orbits the Sun at a greater distance on average than Neptune .
Simplified: Trans-Neptunian Object or TNO is a name astronomers give to anything that orbits or goes around the Sun beyond the planet Neptune but it is not big enough to be a planet or a moon .