After pulling off the ices, the gravity of Saturn would have doomed the moon's silicate core, tugging it closer and closer until it smashed into the planet, the simulation shows.

模拟显示，在冰层脱离之后，土星的引力将导致这颗卫星的硅酸盐核心的毁灭，将它越拉越近，最终撞向这颗行星。

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When it does, gravity will cause the sun's core to contract.

当太阳能量耗尽，地心引力会使得太阳核心缩小。

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Fusion in a star's core produces heat and outward pressure, but this pressure is kept in balance by the inward push of gravity generated by a star's mass.

恒星核心中发生的核聚变产生热能与向外的压力，不过这份压力由恒星质量所产生的内向重力抵消了。

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At Purdue University in Indiana, scientists are working on a reactor-like device that uses water circulated by gravity to keep the core cool.

CNN: Today/Tomorrow - Helping nuclear plants keep their cool

It galloped toward the planet's core, accelerating at gravity's constant 32 feet per second per second.

NPR: Defying Gravity, and Odds, in New Orleans

Unlike any other asteroid known today, Vesta has an iron core surrounded by layers of mantle rock and crust, similar to Earth and Mars, preliminary gravity and density measurements suggest.

WSJ: Asteroid Vesta Gets a Close Study