noun
gravity well
Technical term in astronomy and physics, referring to the gravitational potential field around a massive body. Often used in contexts like planetary science or space travel.
地球の重力井戸から脱出するには、大きな速度が必要だ。
To escape Earth's gravity well, a high velocity is required.
この惑星の重力井戸は深く、探査機の着陸が難しい。
This planet's gravity well is deep, making landing a probe difficult.