Expanding the Definition of Earth-Like Planets and Habitable Zones

The definition of an Earth-like planet is subjective and varies depending on the criteria used. While some consider any rocky planet within a certain mass range to be Earth-like, others argue that it should also have a temperate temperature and a potentially habitable atmosphere. The presence of abundant life, particularly an oxygen-rich atmosphere, would greatly contribute to a planet being considered Earth-like. However, determining these factors is challenging, and the boundaries of what qualifies as Earth-like may narrow as more candidates are discovered.