"planetology" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Dates manquantes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Dérivations en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Lemmes en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en anglais suffixés avec -logy",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "necroplanetology"
    }
  ],
  "etymology_texts": [
    "(Date à préciser) Termedérivé de planet, avec le suffixe -logy"
  ],
  "forms": [
    {
      "form": "planetologies",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en anglais de l’astronomie",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Planétologie."
      ],
      "id": "fr-planetology-en-noun-Tsxfkh-W",
      "topics": [
        "astronomy"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "planetary astronomy"
    },
    {
      "word": "planetary science"
    }
  ],
  "word": "planetology"
}

{
  "categories": [
    "Dates manquantes en anglais",
    "Dérivations en anglais",
    "Lemmes en anglais",
    "Mots en anglais suffixés avec -logy",
    "Noms communs en anglais",
    "anglais"
  ],
  "derived": [
    {
      "word": "necroplanetology"
    }
  ],
  "etymology_texts": [
    "(Date à préciser) Termedérivé de planet, avec le suffixe -logy"
  ],
  "forms": [
    {
      "form": "planetologies",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Lexique en anglais de l’astronomie",
        "Wiktionnaire:Exemples manquants en anglais"
      ],
      "glosses": [
        "Planétologie."
      ],
      "topics": [
        "astronomy"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "planetary astronomy"
    },
    {
      "word": "planetary science"
    }
  ],
  "word": "planetology"
}