"white nebula" meaning in English

{
  "etymology_text": "white + nebula",
  "forms": [
    {
      "form": "white nebulae",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "white nebulae"
      },
      "expansion": "white nebula (plural white nebulae)",
      "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": "topical",
          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
          "parents": [
            "Sciences",
            "Space",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "spiral nebula"
        },
        {
          "word": "great nebula"
        }
      ],
      "glosses": [
        "a nebula that appears white in colouration through a high-powered telescope (nebulae often appear to have some hint of colour through a powerful telescope, but white when not using a powerful instrument); these nebulae were generally to be determined to be galaxies in the 20th century"
      ],
      "id": "en-white_nebula-en-noun-YB8WGj7O",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "nebula",
          "nebula"
        ],
        [
          "white",
          "white"
        ],
        [
          "colouration",
          "colouration"
        ],
        [
          "telescope",
          "telescope"
        ],
        [
          "galaxies",
          "galaxy"
        ]
      ],
      "raw_glosses": [
        "(astronomy, obsolete) a nebula that appears white in colouration through a high-powered telescope (nebulae often appear to have some hint of colour through a powerful telescope, but white when not using a powerful instrument); these nebulae were generally to be determined to be galaxies in the 20th century"
      ],
      "tags": [
        "obsolete"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "word": "white nebula"
}

{
  "coordinate_terms": [
    {
      "word": "spiral nebula"
    },
    {
      "word": "great nebula"
    }
  ],
  "etymology_text": "white + nebula",
  "forms": [
    {
      "form": "white nebulae",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "white nebulae"
      },
      "expansion": "white nebula (plural white nebulae)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with obsolete senses",
        "en:Astronomy"
      ],
      "glosses": [
        "a nebula that appears white in colouration through a high-powered telescope (nebulae often appear to have some hint of colour through a powerful telescope, but white when not using a powerful instrument); these nebulae were generally to be determined to be galaxies in the 20th century"
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "nebula",
          "nebula"
        ],
        [
          "white",
          "white"
        ],
        [
          "colouration",
          "colouration"
        ],
        [
          "telescope",
          "telescope"
        ],
        [
          "galaxies",
          "galaxy"
        ]
      ],
      "raw_glosses": [
        "(astronomy, obsolete) a nebula that appears white in colouration through a high-powered telescope (nebulae often appear to have some hint of colour through a powerful telescope, but white when not using a powerful instrument); these nebulae were generally to be determined to be galaxies in the 20th century"
      ],
      "tags": [
        "obsolete"
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "word": "white nebula"
}