And they're all around about Earth mass.

它们都与地球重量大致相当。

The Sun has a mass 300,000 times the Earth.

太阳的质量是地球的30万倍。

That's roughly the size of Mars or a third of Earth's mass.

内地核的大小和火星相当，大约占地球质量的三分之一。

Losses are only equivalent to approximately 1 quadrillion of one percent of the Earth's mass.

损失仅相当于地球质量的1%的几十亿分之一。

Neptune is more massive than Uranus; 17 times Earth's mass, versus just 14.5 for Uranus.

海王星比天王星更大；是地球质量的17倍，而天王星只有地球质量的14.5倍。

If this core reaches several times Earth's mass, they begin gathering gas from the surrounding dust and gas.

如果这个核心达到地球质量的数倍，它们就会开始从周围的尘埃和气体中收集气体。

About an earth mass planet, we don't know the mass exactly and it's in the habitable zone of that star.

和地球重量大致相当，但我们不知道确切质量，而且那颗行星位于该恒星的可居住区内。

And most simulations suggest that it should be closer to Earth's mass.

大多数模拟表明它应该更接近地球的质量。

We could get away with sacrificing only 2% of the Earth's mass every billion years.

如果每十亿年只牺牲地球质量的 2%，我们就可以逃脱惩罚。

It's only a wee bit smaller — 12,100 kilometers across, about 95% the width of the Earth — and has 80% the Earth's mass.

它只比地球小一点点——直径12100公里，大约是地球宽度的95%——质量是地球的80%。

The whole reason why the Moon is in orbit around the Earth is because there's a gravitational force of Earth's mass acting on the Moon.

月球绕地球运行的全部原因是因为地球质量的引力作用在月球上。

New elements are produced in quantities that dwarf the Earth's mass. Calcium, phosphorus, nickel, more iron… all made in the hellish forge of the supernova heat, and flung outward into the Universe.

新元素产生的数量超过了地球的质量。钙、磷、镍、更多的铁… … 这些都是在超新星爆炸时地狱般的熔炉中产生的，然后被抛向宇宙。

Because the Moon has only an eightieth of the Earth's mass, it requires 97% less energy to travel the quarter of a million miles from the Moon to Earth-orbit than the 200 mile-journey from Earth's surface into orbit!

因为月球的重只有地球的1/8，因此，从月球到地球的25万英里所消耗的能量要比从地球表面进入地球轨道的200英里所耗能量少97%。