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As the universe expands, distant galaxies slip beyond the cosmological horizon, never to be observed again.
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As the universe expands, distant galaxies slip beyond the cosmological horizon, never to be observed again.
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Related words
cosmological horizon
Noun
Japanese Meaning
宇宙論的地平線：天文学において、観測者が存在する宇宙において、現在の宇宙の年齢内ではその距離まで光（または他の光速で運ぶ粒子）が届かないため、観測不可能な領域の境界を指す。
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