Eng: distance from a

事件視界

distance from a black hole where the escape velocity equals the speed of light and within which nothing can escape the black hole (The)

冰線

distance from a star where is it cold enough for volatile compounds such as water, carbon dioxide, or methane to form solid ice grains (The)

雪線

distance from a star where is it cold enough for volatile compounds such as water, carbon dioxide, or methane to form solid ice grains (The)