"emission nebula" meaning in English

{
  "forms": [
    {
      "form": "emission nebulae",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "emission nebulas",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "emission nebulae",
        "2": "s"
      },
      "expansion": "emission nebula (plural emission nebulae or emission nebulas)",
      "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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with German translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
          "parents": [
            "Sciences",
            "Space",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2000 October 12, Prof. Daniel Styer, “Nebulae”, in Oberlin College Physics Department, retrieved 2014-04-07:",
          "text": "The Orion nebula is an emission nebula—it glows with its own light.",
          "type": "quote"
        },
        {
          "ref": "2005 June 5, Suzanne MacNeille, “On a Dig or Through a Telescope, You Just Might Learn Something”, in New York Times, retrieved 2014-04-07:",
          "text": "Kitt Peak National Observatory, in Arizona, 56 miles southwest of Tucson, offers a rare opportunity to spend an entire night looking through powerful telescopes at galaxies, planetary emission nebulae and star clusters.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A nebula composed of ionized gases which produce visible light (as distinct from a reflection nebula, which reflects the light produced by neighboring stars)."
      ],
      "id": "en-emission_nebula-en-noun-zImWTbbz",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "ionize",
          "ionize"
        ],
        [
          "gas",
          "gas"
        ],
        [
          "visible",
          "visible"
        ],
        [
          "light",
          "light"
        ],
        [
          "reflection nebula",
          "reflection nebula"
        ]
      ],
      "raw_glosses": [
        "(astronomy) A nebula composed of ionized gases which produce visible light (as distinct from a reflection nebula, which reflects the light produced by neighboring stars)."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "type of nebula",
          "tags": [
            "masculine"
          ],
          "word": "Emissionsnebel"
        }
      ]
    }
  ],
  "word": "emission nebula"
}

{
  "forms": [
    {
      "form": "emission nebulae",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "emission nebulas",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "emission nebulae",
        "2": "s"
      },
      "expansion": "emission nebula (plural emission nebulae or emission nebulas)",
      "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 quotations",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with German translations",
        "en:Astronomy"
      ],
      "examples": [
        {
          "ref": "2000 October 12, Prof. Daniel Styer, “Nebulae”, in Oberlin College Physics Department, retrieved 2014-04-07:",
          "text": "The Orion nebula is an emission nebula—it glows with its own light.",
          "type": "quote"
        },
        {
          "ref": "2005 June 5, Suzanne MacNeille, “On a Dig or Through a Telescope, You Just Might Learn Something”, in New York Times, retrieved 2014-04-07:",
          "text": "Kitt Peak National Observatory, in Arizona, 56 miles southwest of Tucson, offers a rare opportunity to spend an entire night looking through powerful telescopes at galaxies, planetary emission nebulae and star clusters.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A nebula composed of ionized gases which produce visible light (as distinct from a reflection nebula, which reflects the light produced by neighboring stars)."
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "ionize",
          "ionize"
        ],
        [
          "gas",
          "gas"
        ],
        [
          "visible",
          "visible"
        ],
        [
          "light",
          "light"
        ],
        [
          "reflection nebula",
          "reflection nebula"
        ]
      ],
      "raw_glosses": [
        "(astronomy) A nebula composed of ionized gases which produce visible light (as distinct from a reflection nebula, which reflects the light produced by neighboring stars)."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "type of nebula",
      "tags": [
        "masculine"
      ],
      "word": "Emissionsnebel"
    }
  ],
  "word": "emission nebula"
}