section_path: Overview/Definitions
section_name: Definitions
paragraph_text: Definitions
  
  According to Lunine, "oceans" have been defined as "stable, globe-girdling bodies of liquid water." In addition, "Ocean worlds is the label given to objects in the solar system that host stable, globe-girdling bodies of liquid water," in contrast to the terms "'ocean planet' and 'water world', both of which refer to exoplanets (planets orbiting other stars) with substantial mass fractions of water in their bulk compositions."