(Lauer 2021, "New Horizons Observations of the Cosmic Optical Background", The Astrophysics Journal) Panalungtik ngaliwat gambar anu dicandak ku teleskop sareng kaméra pesawat ruang angkasa saderhana sareng milarian anu luar biasa bosen, anu disebat "ruang kosong" gambar, sareng dikurangan sadaya sumber cahaya anu dipikaterang, kalebet lampu ti béntang, cahaya sumebar tina Bima Sakti, sareng bahkan cahaya ti galaksi hipotésis, sareng aranjeunna masih kénéh kénéh kénéh kalayan seueur cahaya anu teu jelas ampir sami sareng jumlah lampu anu dipikaterang.
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