Last Updated
：2025/12/04
gravitational keyhole
Noun
Japanese Meaning
天文学における「重力キーホール」とは、惑星の重力が、通過中の小惑星などの軌道を微妙に変化させることで、その小惑星が将来的にその惑星に衝突する可能性を生じさせる、非常に狭い空間領域のことを指します。
（ plural ）
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(astronomy) A tiny region of space where a planet's gravity would alter the orbit of a passing asteroid such that the asteroid would collide with that planet on a given future orbital pass.
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gravitational keyhole
During the asteroid's close approach, astronomers calculated that it might pass through a gravitational keyhole, setting up a future collision course with Earth.
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During the asteroid's close approach, astronomers calculated that it might pass through a gravitational keyhole, setting up a future collision course with Earth.
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