"light barrier" meaning in English

{
  "etymology_text": "On the grounds that special relativity predicts that no object can travel faster than light. Compare sound barrier.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "light barrier (uncountable)",
      "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": "Faster-than-light travel",
          "orig": "en:Faster-than-light travel",
          "parents": [
            "Astrophysics",
            "Relativity",
            "Science fiction",
            "Travel",
            "Astronomy",
            "Physics",
            "Fiction",
            "Speculative fiction",
            "Human activity",
            "Transport",
            "Sciences",
            "Space",
            "Artistic works",
            "Genres",
            "Human behaviour",
            "All topics",
            "Nature",
            "Art",
            "Entertainment",
            "Human",
            "Fundamental",
            "Culture",
            "Society"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Light",
          "orig": "en:Light",
          "parents": [
            "Energy",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Physical constants",
          "orig": "en:Physical constants",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Relativity",
          "orig": "en:Relativity",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The speed of light, seen as a barrier to faster-than-light travel."
      ],
      "id": "en-light_barrier-en-noun-mtEgOhHH",
      "links": [
        [
          "speed of light",
          "speed of light"
        ],
        [
          "faster-than-light",
          "faster-than-light"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "light barrier"
}

{
  "etymology_text": "On the grounds that special relativity predicts that no object can travel faster than light. Compare sound barrier.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "light barrier (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "en:Faster-than-light travel",
        "en:Light",
        "en:Physical constants",
        "en:Relativity"
      ],
      "glosses": [
        "The speed of light, seen as a barrier to faster-than-light travel."
      ],
      "links": [
        [
          "speed of light",
          "speed of light"
        ],
        [
          "faster-than-light",
          "faster-than-light"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "light barrier"
}