"massive astrophysical compact halo object" meaning in English

{
  "etymology_text": "A back-formation from MACHO, which is used as an acronym for massive compact halo object. Words used to fill in the apparently missing \"A\" word include astrophysical and astronomical.",
  "forms": [
    {
      "form": "massive astrophysical compact halo objects",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "massive astrophysical compact halo object (plural massive astrophysical compact halo objects)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "massive compact halo object"
        }
      ],
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
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          "langcode": "en",
          "name": "Astronomy",
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          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
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            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of massive compact halo object"
      ],
      "id": "en-massive_astrophysical_compact_halo_object-en-noun-4-F~6fyb",
      "links": [
        [
          "astronomy",
          "astronomy"
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        [
          "physics",
          "physics"
        ],
        [
          "massive compact halo object",
          "massive compact halo object#English"
        ]
      ],
      "raw_glosses": [
        "(astronomy, physics) Alternative form of massive compact halo object"
      ],
      "tags": [
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      ],
      "topics": [
        "astronomy",
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Massive compact halo object"
      ]
    }
  ],
  "word": "massive astrophysical compact halo object"
}

{
  "etymology_text": "A back-formation from MACHO, which is used as an acronym for massive compact halo object. Words used to fill in the apparently missing \"A\" word include astrophysical and astronomical.",
  "forms": [
    {
      "form": "massive astrophysical compact halo objects",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "massive compact halo object"
        }
      ],
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        "en:Astronomy",
        "en:Physics"
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      "glosses": [
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      ],
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        [
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          "astronomy"
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        [
          "physics",
          "physics"
        ],
        [
          "massive compact halo object",
          "massive compact halo object#English"
        ]
      ],
      "raw_glosses": [
        "(astronomy, physics) Alternative form of massive compact halo object"
      ],
      "tags": [
        "alt-of",
        "alternative"
      ],
      "topics": [
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        "natural-sciences",
        "physical-sciences",
        "physics"
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      "wikipedia": [
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  "word": "massive astrophysical compact halo object"
}