Six years of observations revealed the presence of five planets between 13 and 25 times the mass of Earth.
经过长达六年的观测，发现有五颗行星的质量是地球的13-25倍。
Airborne soot and dirt from the impact blanketed Earth, inhibiting photosynthesis and triggering mass extinction of species.
撞击产生的烟尘和灰尘覆盖了地球，抑制了光合作用，引发了物种的大规模灭绝。
The exoplanet is a few times the mass of Earth, but it should still be small enough to be rocky rather than a gas giant like Jupiter.
这个系外行星的质量是地球的几倍，但是它足够小，能够由岩石构成，而不是像木星是一团巨大的气体。
The first is a pair of planets, each about the mass of Jupiter, that whirl around their home star 15 light years from Earth in perfect lockstep.
第一个是一对质量与木星差不多的行星，这对行星步调一致地围绕距离地球15光年的母恒星旋转。
The largest terrestrial planet, Earth has a diameter only one quarter as great as the diameter of the smallest Jovian planet, Neptune, and its mass is only one seventeenth as great.
最大的类地行星地球的直径仅仅是最小的类木行星海王星的四分之一，而且地球的质量仅仅是其质量的十七分之一。
The fossil record indicates that in all the time that animals have inhabited Earth, there have been five great mass extinctions, dinosaurs being the most recent.
化石记录表明，在地球有动物居住的所有时期，已经有五次大灭绝发生，恐龙是最近的一次。
Scientists have linked the mass extinction at the end of the Cretaceous with a meteorite impact on Earth.
科学家将白垩纪末期的大灭绝与地球上的陨石撞击联系起来。
If a rocky planet is big enough - say, 10 times the mass of Earth - it can vacuum up so much hydrogen that its atmosphere ends up constituting most of the planet.
如果一个由岩石组成的行星足够的大——比方说，质量是地球的10倍——它可以吸收如此多的氢，以至于他的大气层最终会形成大部分的行星。
It is about 8 times the mass of Earth, and located in an orbit just right for liquid water to exist on the surface.
它大概是地球质量的8倍而且它所在的轨道恰好有益于在其表面有液态水的存在。
A fourth object, which has more than ten times the mass of Earth and is the nearest to the star yet found, was noticed by another team in 2004.
第四颗行星被另一个科研小组于2004年发现，它有着地球十倍的质量，而且是与那颗已知恒星距离最近的。
Six years of observations revealed the presence of five planets between 13 and 25 times the mass of Earth, or about the mass of Neptune, that orbit the parent star once every 6 to 600 days.
经过长达六年的观察，科学家发现有五颗行星的质量是地球的13-25倍，或者说，与海王星的质量差不多，它们围绕恒星的旋转周期在6到600天之间。
So now I will put in the mass of the Earth here.
这样我就又考虑，到了地球的质量。
Scientists think Earth started off as a waterless mass of rock.
科学家认为，地球最开始只是一团无水的岩石。
Its mass is about 55 times the mass of Earth.
它的质量大约是地球质量的55倍。
But you could have said "Well, let's not take the acceleration of the Earth, but let's take the mass of the Earth itself Very reasonable, right?
我还可以这样说,“不取地球的,加速度，取地球的质量会怎么样,也很合理，是吧？
These occasional comet showers could be why the mass extinctions on Earth are so regular, some scientists believe.
一些科学家认为，这些偶然的彗星雨可能就是为什么地球上的大规模物种灭绝如此规律地发生的原因。
Medical researchers will use results of protein analyses to determine which crystals to mass-produce on Earth.
医学研究者将利用蛋白质分析的结果，决定哪些晶体可在地球上大规模生产。
If you take the Earth itself around the sun because we can use all these equations replace the mass of the Earth by the mass of the sun, and then we can do this for planets.
如果你算地球绕太阳，因为我们用所有这些，等式，以太阳质量，代替地球质量，然后我们再用行星做。
A super-Earth is a planet with a mass larger than Earth's, roughly up to 10 times greater.
超级地球是指那些比地球质量大的系外行星，它们的质量一般约为地球的10倍左右。
The planets are bigger than Earth -- one is 4.2 times the mass, one is 6.7 times and the third is 9.4 times.
这些行星都要比偶们的地球大，她们的质量分别是地球的4.2，6.7，9.4倍。
These changes are caused by anything that moves mass around on the Earth.
地球上物质体的任何移动都会引起这些变化。
Well, the earth is going to fall towards the apple — So the force on the earth is the mass of the earth times the acceleration of the earth.
地球也会坠向苹果-，因此地球上的力与地球的质量相等，再乘以地球的加速度。
Mars is nearly half the size of Earth but around one tenth the mass.
火星大小几乎是地球的一半质量是地球的1/10.
The team also said they found a planet 7.5 times the mass of Earth orbiting the star HD 181433 in 9.5 days.
该小组还说他们发现了一颗质量是地球的7.5倍的行星，以9.5天为一个公转周期，绕着HD 181433号恒星转动。
Another solar system has a planet 22 times the mass of Earth, orbiting every four days, and a Saturn-like planet with a 3-year period.
另一个太阳系有一颗质量是地球22倍的行星(译者：可怜的小地球)，公转周期为4天，还有一颗公转周期为3年的类木星行星。
The planet, referred to as HD85512b, is about 3.5 times the mass of Earth and may be close enough to its primary star to contain water.
这颗编号为HD 85512b的行星是地球质量的3.5倍，离其主恒星距离较近，足以容纳水分。
And so you see that the gravitational force due to the earth on a particular mass is linearly proportional with the mass.
你知道重力由地球产生，它与物体质量，成正比。
COROT-7b is a rocky mass like Earth, though twice its size.
尽管COROT - 7b的大小是地球的两倍，但它像地球一样拥有大量的岩石。
COROT-7b is a rocky mass like Earth, though twice its size.
尽管COROT - 7b的大小是地球的两倍，但它像地球一样拥有大量的岩石。
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