Astronomers know that Pluto and Triton have nearly the same size, mass, and density.

天文学家们知道冥王星和海王卫一拥有几乎相同的体积、质量和密度。

First of all, astronomers look for a star.

首先，天文学家要寻找一颗恒星。

Particle physicists and astronomers collaborate often.

粒子物理学家和天文学家经常合作。

Some blame for the current controversy belongs to astronomers.

有人把如今的争议归因于天文学家。

In recent years, astronomers have found nearly 400 new planets with stars.

近年来，天文学家已经发现了近400颗新的有行星的恒星。

Now astronomers think it was a meteor that burned up high in the atmosphere.

现在天文学家认为那是一颗在高空燃烧的流星。

Astronomers were glad to know that their suppositions about the moon were correct.

天文学家很高兴知道他们对于月球的假设是正确的。

Astronomers did eventually figure out what sunspots had to do with magnetic fields.

天文学家最终确实发现了太阳黑子与磁场的关系。

Knowing the width of Earth's orbit, the parallax shift lets astronomers calculate the distance.

知道了地球轨道的宽度，视差偏移可以让天文学家计算距离。

After many years of scrutinizing, astronomers have found a planet that is similar to the Earth.

经过多年的仔细研究，天文学家发现了一颗与地球相似的行星。

Now, many astronomers are looking for new planets and new places of humans to live in the future.

现在，许多天文学家正在寻找新的行星和未来人类居住的新地方。

Astronomers have detected an asteroid not far from Earth, moving in the same orbit around the Sun.

天文学家在距离地球不远处发现一颗小行星，它与地球在同一轨道上围绕太阳运行。

But astronomers laboured hard to analyse the results of these expeditions to observe Venus transits.

但是天文学家辛苦分析这些观测金星凌日的探险活动的结果。

However, if the planet is in a good position, astronomers look for three key things: water, air and rock.

然而如果这颗行星处于很好的位置，天文学家会寻找三样关键的东西：水、空气和岩石。

Then some astronomers came up with the idea that atmospheric ammonia might have acted as a greenhouse gas.

后来一些天文学家提出，大气中的氨可能起到温室气体的作用。

"The ancient Hawaiians were astronomers," wrote Queen Liliuokalani, Hawaii's last reigning monarch, in 1897.

1897年，夏威夷最后一位在位君主利留卡拉尼女王写道：“古代夏威夷人是天文学家。”

Their astronomers had discovered that at a certain time of year the brightest star, Sirius, would disappear.

他们的天文学家发现，在一年中的某个时候，最亮的天狼星会消失。

Astronomers therefore prefer dry sites with little water vapor, which is generally found at higher altitudes.

因此，天文学家更喜欢水蒸气很少的干燥地点，而水蒸气通常出现在海拔较高处。

For centuries, transits of Venus have drawn explorers and astronomers alike to the four corners of the globe.

几个世纪以来，金星凌日吸引了探险家和天文学家们汇聚到地球的四个角落。

Many astronomers use radio telescopes for space experiments, which work just as well during the daylight hours.

许多天文学家使用射电望远镜进行太空实验，这些望远镜在白天也同样有效。

When later European astronomers wrote about sunspots, they didn't believe that the spots were actually on the Sun.

后来，欧洲的天文学家们写了一些关于太阳黑子的文章，但他们并不相信这些黑子确实存在于太阳上。

Astronomers have devised a technique called adaptive optics that can beat Earth atmosphere at its own game of blurring.

天文学家已经发明出一种叫做自适应光学的技术，可以以自己的模糊方式突破大气层。

Until recently most astronomers believed that the space between the galaxies in our universe was a near-perfect vacuum.

直到最近，大多数天文学家都认为我们宇宙中星系之间的空间是近乎完美的真空。

Astronomers tried to estimate what solar mass could produce the required luminosity to explain liquid water on these planets.

天文学家试图通过估计太阳质量能产生多少必需的光来解释这些行星上的液态水。

Astronomers suspect that pairs of planets also engage in this slingshot activity, leaving them in disturbed, elliptical orbits.

天文学家怀疑成对的行星也参与了这种弹弓活动，使它们处于不规则的椭圆轨道上。

A team of astronomers working at the European Southern Observatory in Chile, led by Simon Clark, spotted a flyer in the cosmos.

在智利的欧洲南方天文台，由西蒙·克拉克领导的天文学家团队发现了宇宙中的一个飞行物。

In addition to conventional galaxies, the universe contains very dim galaxies that until recently went unnoticed by astronomers.

除了传统的星系，宇宙中还有一些非常暗淡的星系，直到最近才被天文学家发现。

This was the thinking of European astronomers until the introduction of the telescope, which brings us to our old friend, Galileo.

这是望远镜出现前欧洲天文学家的想法，这就说到了我们的老朋友伽利略。

Calculating this angle would allow astronomers to measure what was then the ultimate goal: the distance of the Earth from the Sun.

计算这个角度可以让天文学家测量地球到太阳的距离，这是当时的终极目标。

The latest research will help astronomers distinguish between the two sources of methane in their search for extraterrestrial life.

这项最新发现将帮助天文学家在寻找外星生命过程中辨别两种来源不同的甲烷。