"Hill sphere" meaning in English

{
  "etymology_text": "Defined by the American astronomer George William Hill.",
  "forms": [
    {
      "form": "Hill spheres",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Hill sphere (plural Hill spheres)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
          "parents": [
            "Sciences",
            "Space",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The region in which a given astronomical body dominates the attraction of satellites."
      ],
      "id": "en-Hill_sphere-en-noun-Sz-z0sqC",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "attraction",
          "attraction"
        ],
        [
          "satellite",
          "satellite"
        ]
      ],
      "raw_glosses": [
        "(astronomy) The region in which a given astronomical body dominates the attraction of satellites."
      ],
      "related": [
        {
          "word": "Hill radius"
        }
      ],
      "synonyms": [
        {
          "word": "Roche sphere"
        }
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "wikipedia": [
        "Hill sphere"
      ]
    }
  ],
  "word": "Hill sphere"
}

{
  "etymology_text": "Defined by the American astronomer George William Hill.",
  "forms": [
    {
      "form": "Hill spheres",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Hill sphere (plural Hill spheres)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "Hill radius"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Astronomy"
      ],
      "glosses": [
        "The region in which a given astronomical body dominates the attraction of satellites."
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "attraction",
          "attraction"
        ],
        [
          "satellite",
          "satellite"
        ]
      ],
      "raw_glosses": [
        "(astronomy) The region in which a given astronomical body dominates the attraction of satellites."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "wikipedia": [
        "Hill sphere"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Roche sphere"
    }
  ],
  "word": "Hill sphere"
}