A region of gas and dust from exploding stars in the Milky Way galaxy starts to collapse under its own gravity, forming a small star surrounded by a disk of rocky material and gas.
银河系漩涡展开过程中某些区域的星群之气体尘埃在引力作用下，形成由岩石物质和气体包围的小行星。
Even Newtonian gravity works quite well within its domain (eg small velocities).
即使是牛顿引力工程领域内的比较好(如小速度)。
Considering Pluto's small size, it was a surprise to see that its gravity was strong enough to hold on to an atmosphere at all.
鉴于冥王星个头很小，看到其引力竟然足以“拴住”大气层很让人意外。
Because of its economy and safety, the masonry gravity dam is used in many medium and small-sized engineering.
浆砌石重力坝由于其经济性和安全性，在很多中小型工程中被采用。
Because of its economy and safety, the masonry gravity dam is used in many medium and small-sized engineering.
浆砌石重力坝由于其经济性和安全性，在很多中小型工程中被采用。
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