"light echo" meaning in English

{
  "forms": [
    {
      "form": "light echos",
      "tags": [
        "plural"
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    },
    {
      "form": "light echoes",
      "tags": [
        "plural"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
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      ],
      "glosses": [
        "A phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance, analogous to an echo of sound."
      ],
      "id": "en-light_echo-en-noun-6DkcgOCG",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "phenomenon",
          "phenomenon"
        ],
        [
          "light",
          "light"
        ],
        [
          "reflect",
          "reflect"
        ],
        [
          "surface",
          "surface"
        ],
        [
          "source",
          "source"
        ],
        [
          "observer",
          "observer"
        ],
        [
          "delay",
          "delay"
        ],
        [
          "relative",
          "relative"
        ]
      ],
      "raw_glosses": [
        "(astronomy) A phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance, analogous to an echo of sound."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "phenomenon observed in astronomy",
          "tags": [
            "neuter"
          ],
          "word": "Lichtecho"
        }
      ],
      "wikipedia": [
        "light echo"
      ]
    }
  ],
  "word": "light echo"
}

{
  "forms": [
    {
      "form": "light echos",
      "tags": [
        "plural"
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    },
    {
      "form": "light echoes",
      "tags": [
        "plural"
      ]
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Astronomy"
      ],
      "glosses": [
        "A phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance, analogous to an echo of sound."
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "phenomenon",
          "phenomenon"
        ],
        [
          "light",
          "light"
        ],
        [
          "reflect",
          "reflect"
        ],
        [
          "surface",
          "surface"
        ],
        [
          "source",
          "source"
        ],
        [
          "observer",
          "observer"
        ],
        [
          "delay",
          "delay"
        ],
        [
          "relative",
          "relative"
        ]
      ],
      "raw_glosses": [
        "(astronomy) A phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance, analogous to an echo of sound."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "wikipedia": [
        "light echo"
      ]
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "phenomenon observed in astronomy",
      "tags": [
        "neuter"
      ],
      "word": "Lichtecho"
    }
  ],
  "word": "light echo"
}