"Mercury Seven" meaning in English

{
  "forms": [
    {
      "form": "the Mercury Seven",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
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        "def": "1",
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      "expansion": "the Mercury Seven",
      "name": "en-proper noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "History of the United States",
          "orig": "en:History of the United States",
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            "History",
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            "Fundamental",
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          "name": "Individuals",
          "orig": "en:Individuals",
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        },
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          "name": "NASA",
          "orig": "en:NASA",
          "parents": [
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            "Aviation",
            "Applied sciences",
            "Space",
            "Aeronautics",
            "Transport",
            "Sciences",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "NASA's first astronaut group, consisting of seven members, chosen in 1959: Scott Carpenter, Gordon Cooper, John Glenn, Gus Grissom, Wally Schirra, Alan Shepard, and Deke Slayton."
      ],
      "id": "en-Mercury_Seven-en-name-HAiY-14H",
      "wikipedia": [
        "Alan Shepard",
        "Deke Slayton",
        "Gordon Cooper",
        "Gus Grissom",
        "John Glenn",
        "Scott Carpenter",
        "Wally Schirra"
      ]
    }
  ],
  "word": "Mercury Seven"
}

{
  "forms": [
    {
      "form": "the Mercury Seven",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "def": "1",
        "head": "Mercury Seven"
      },
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      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
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        "English lemmas",
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        "en:Individuals",
        "en:NASA"
      ],
      "glosses": [
        "NASA's first astronaut group, consisting of seven members, chosen in 1959: Scott Carpenter, Gordon Cooper, John Glenn, Gus Grissom, Wally Schirra, Alan Shepard, and Deke Slayton."
      ],
      "wikipedia": [
        "Alan Shepard",
        "Deke Slayton",
        "Gordon Cooper",
        "Gus Grissom",
        "John Glenn",
        "Scott Carpenter",
        "Wally Schirra"
      ]
    }
  ],
  "word": "Mercury Seven"
}