科学ジャーナリストが、1.2光年離れた系外惑星を観測したジェイムズ・ウェッブ宇宙望遠鏡について報道している。光速は約3 × 10⁸ m/sである。この惑星からの光が地球に到達するまで何年かかるか？ - IX Labs

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