"astronomical transient" meaning in English

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  "etymology_text": "astronomical + transient From being a traditional astronomical source (optical astronomy, and star-like) of an ephemeral nature",
  "forms": [
    {
      "form": "astronomical transients",
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      "glosses": [
        "A localized discrete transient optical spectrum event at astronomical distances."
      ],
      "id": "en-astronomical_transient-en-noun-Bnjxu9rC",
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          "optical spectrum",
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        "(astronomy) A localized discrete transient optical spectrum event at astronomical distances."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "wikipedia": [
        "en:Transient astronomical event"
      ]
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  "word": "astronomical transient"
}

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  "etymology_text": "astronomical + transient From being a traditional astronomical source (optical astronomy, and star-like) of an ephemeral nature",
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    {
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      "tags": [
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        "A localized discrete transient optical spectrum event at astronomical distances."
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        "(astronomy) A localized discrete transient optical spectrum event at astronomical distances."
      ],
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        "astronomy",
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        "en:Transient astronomical event"
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  "word": "astronomical transient"
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