Simplify the following text for a Grade 7 native English-speaking person.
Original: The habitable zone may also be called the `` life zone '' , `` comfort zone '' , `` green belt '' or `` Goldilocks Zone '' ( because it 's neither too hot nor too cold , but `` just right '' ) .
Simplified: The HZ may also be referred to as the `` life zone '' , `` Comfort Zone '' , `` Green Belt '' or `` Goldilocks Zone '' .