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    "story_id": "mp-2026-08-03-009",
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    "headline": "Antarctic Night Had a Different Infrared Darkness",
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    "dek": "The first continuous J- and H-band sequence from polar day into polar night measured background changes at Dome A.",
    "summary": "The first continuous J- and H-band sequence from polar day into polar night measured background changes at Dome A.",
    "body_text": "A binocular infrared telescope recorded fixed-pointing observations from February through May 2024 at Dome A. The analysis places twilight-to-night boundaries at solar elevations near minus 9.3 degrees in J and minus 7.4 degrees in H, and finds polar-night background darker than comparable elevations during ordinary day-night alternation. H-band brightness also tracked sunspot number more clearly, so longer monitoring across the solar cycle remains important.",
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    "first_published_at": "2026-08-03T09:00:00.000-04:00",
    "modified_at": "2026-08-03T09:00:00.000-04:00",
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    "tags": [
      "Antarctica",
      "infrared astronomy",
      "observatories"
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    {
      "source_id": "source-2026-08-03-009",
      "title": "Astronomy & Astrophysics: infrared sky brightness at Dome A",
      "publisher": "EDP Sciences",
      "url": "https://doi.org/10.1051/0004-6361/202660525",
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