Escape Speed
Core Sentence / 核心句
Escape speed is the minimum launch speed that makes total orbital energy zero.
Watch Out / 易错点
是距天体中心距离；逃逸后重力仍存在，只是轨道不再束缚。
Escape speed is the minimum launch speed that makes total orbital energy zero.
是距天体中心距离；逃逸后重力仍存在，只是轨道不再束缚。