The habitable zone is defined as the region around a star where a planet could maintain liquid water on its surface without turning to ice or gas. The fact that this water is neither too hot nor too cool has also led to the habitable zone being nicknamed the Goldilocks zone. Even on cold planets far from their stars, liquid water can exist beneath thick ice layers, as subglacial lakes or through internal heating. Similar environments on Earth, such as Antarctica’s subglacial lakes, support microbial life, demonstrating that surface liquid water is not the only possible habitat. Through a reassessment of habitable zone models and boundary calculations, this study expands the range of worlds considered potentially habitable, revealing new targets in the search for life.