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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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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And the researchers say that the rediscovered Russian reflector is particularly useful for studying the moon's liquid core and testing ideas about gravity.

研究者们还表示重新找到的俄国反射器对于研究月球液核并测试有关重力的猜想大有裨益。

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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