Einstein theory of relativity told us that mass and energy determine the geometry of spacetime and any curvature of this spacetime shows itself as the gravitational force 爱因斯坦的相对论提出，质量和能量决定时空的几何形状，而时空的弯曲率则以引力的形式表达出来。
Columbus , who had discovered the new world , changed his fate because he knew a lunar eclipse beforehand . tides are also mainly produced by the gravitational pull from the moon 发现新大陆的哥伦布，就因为预先知道月食而扭转乾坤潮汐涨退也是主要受月球引力的影响而产生。
Columbus , who had discovered the new world , changed his fate because he knew a lunar eclipse beforehand . tides are also mainly produced by the gravitation pull from the moon 发现新大陆的哥伦布，就因为预先知道月食而扭转乾坤；潮汐涨退也是主要受月球引力的影响而产生。
Columbus , who had discovered the new world , changed his fate because he knew a lunar eclipse beforehand . tides are also mainly produced by the gravitational pull from the moon 发现新大陆的哥伦布，就因为预先知道月食而扭转乾坤；潮汐涨退也是主要受月球引力的影响而产生。
Use key will be to block the movement of export , not to fly in space without gravity . you every step of moving the barrier walls have carefully count , and as for gaining more relevant 使用方向键将可移动的方块送到出口，注意不要飞向没有引力的太空，你的每一步移动都有墙壁的阻挡，仔细算好，争取多过几关。
Introduction : use key will be to block the movement of export , not to fly in space without gravity . you every step of moving the barrier walls have carefully count , and as for gaining more relevant 使用方向键将可移动的方块送到出口，注意不要飞向没有引力的太空，你的每一步移动都有墙壁的阻挡，仔细算好，争取多过几关。
As the comet can reach the orbit of jupiter , its own orbit is prone to change by jupiter s gravitation . in fact , the comet has been ripped into pieces by this immense force , and may vanish completely in a few decades time 由于这颗彗星远日点在木星轨道附近，因此常受木星引力的影响而改变轨道，现时已被撕裂成数十块，数十年后，这颗彗星恐怕便会灰飞烟灭。
Black holes are objects with such huge gravitational field that not even light , traveling at the highest speed allowed in the universe , can escape . in 1971 john wheeler named such objects black holes because even light cannot escape from them 黑洞是拥有强大引力的物体，引力之大即使是宇宙中速度最高的光线也不能逃离黑洞亦因如此约翰威拿于1971年将这种物体命名为黑洞。
For many years the cosmological constant was assumed to be zero , since no measurement gave positive indication to the contrary . if gravity were the only force acting to alter the expansion rate , then the universe would be expected to be decelerating 以纯理论探讨来说，我们当然可以保留这个宇宙常数，但多年来的天文观测结果，并不支持这个宇宙反引力的存在，所以科学家一直假设这个常数为零。
On the other hand , einstein discovered that the maximum velocity of any object is the speed of light . therefore , if the escape velocity on the surface of an object is greater than the speed of light , then nothing , including light , can escape from it 另一方面，爱恩斯坦的相对论断言宇宙中最高的速度便是光速，所以如所需的逃逸速度大于光速，那么宇宙中包括光在内的一切都不可能逃离引力的魔掌，这颗恒星便成为
