original: The habitable zone (HZ) in astronomy is a region of space where stellar conditions are favorable for life as it is found on Earth.
simplifications: The habitable zone in astronomy is an area where conditions are favorable for life. The habitable zone is a location in space where living conditions are comparable to conditions on Earth. The habitable zone (HZ) in astronomy is a region of space. Conditions must be favorable for life, like Earth. The habitable zone (HZ) in astronomy is a region of space where conditions are favorable for life. In the study of space the habitable zone is an area where conditions are similar to Earth's allowing life to form. The habitable zone  is a region of space in astronomy, where stellar conditions are favorable for life as it is found on Earth. The habitable zone is a part of space with conditions that could support life. The habitable zone in astronomy is a part of space where life like what we have on Earth can exist. Astronomy considers the habitable zone (HZ) a region of space where stellar conditions are favorable for Earth life. The habitable zone (HZ) in astronomy is an area of space where stellar outcomes are favorable to life as they are found on Earth.