Last Updated
：2025/11/20
Oort Cloud
Proper noun
Japanese Meaning
(天文学) 太陽系の外側に存在するとされる球状の領域で、太陽から約50,000〜100,000天文単位（約1光年）離れた位置に広がり、彗星の大部分の起源と考えられている氷および小天体の集まりを指す。
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(astronomy) The Solar System's Oort cloud, extending from 50,000 to 100,000 astronomical units (approximately 1 light year) from the sun; supposedly the source of most comets around the Solar System.
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Oort Cloud
Astronomers theorize that long-period comets originate from the Oort Cloud, a distant reservoir of icy bodies at the edge of the Solar System.
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Astronomers theorize that long-period comets originate from the Oort Cloud, a distant reservoir of icy bodies at the edge of the Solar System.
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