It happened once in the observable universe, and we are it.
它只在这个可观测的宇宙里发生了一次，我们赶上了。
It is one of billions of galaxies in the observable universe.
这是我们目前可以观测到的宇宙中数以亿计的星系中的一个。
Their observable universe also used to be the size of a grapefruit.
而他们的可见宇宙也曾经只有葡萄柚般的大小。
Strictly speaking, the observable Universe depends on the location of the observer.
严格地说，观测宇宙取决于所在地的观察员出席了会议。
The number of galaxies cannot be counted—the observable universe alone may contain 100 billion.
星系的数量无法统计——可能仅可见宇宙就包含1000亿个星系。
The average imprecision in measuring the size of the observable universe is about10-15 meter.
测量可见宇宙大小的平均不准确度大约是10-15公尺。
The average imprecision in measuring the size of the observable universe is about 10-15 meter.
测量可见宇宙大小的平均不准确度大约是10 - 15公尺。
Theoretically, black holes can have any size, from microscopic to near the size of the observable universe.
理论上，黑洞可以有任何大小，从微观到接近可见宇宙的大小。
Spacetime also appears to have a simply connected topology, at least on the length-scale of the observable universe.
时空似乎也有一个简单连接的拓扑结构，至少的长度，规模之大可见的宇宙。
Basically, our observable universe begins around 13.7 billion years ago in a state of exquisite order, exquisitely low entropy.
基本上，我们可观测的宇宙是从大约137亿年前的一种精致秩序(异常低的熵)状态中开始的。
However, the effects of quantum mechanics are generally not significant when considering the observable Universe as a whole.
然而，量子力学效应当认为可见宇宙为一整体时候通常不重要。
The observable universe would have had no chance of coming into being, as these opposing particles would have wiped each other out.
目前可观测的宇宙将没有机会形成，因为相反粒子将马上清除彼此。
When scientists talk about the observable universe, they don't just mean as far out as the eye, or even the most powerful telescope, can see.
当科学家们谈及可见宇宙时，他们的意思不仅仅是指眼睛所能看到的，甚至也不局限于利用最具威力的望远镜所能看到的。
I'm fitting in with a line of thought in modern cosmology that says that the observable universe is not all there is. It's part of a bigger multiverse.
我与现代宇宙学的一系列观点相一致，现代宇宙学说我们观察到的宇宙并非现存的这些，它只是更大的多元宇宙(multiverse)的一部分。
Maybe the probability of life spontaneously appearing is so low, that Earth is the only planet in the galaxy, or in the observable universe, in which it happened.
或许生命自然出现的可能性是如此的小，以致于地球是银河系中或可观测到的宇宙中的唯一的行星，在这颗行星中产生了生命。
Thirty years ago the prevailing view among biologists was that life resulted from a chemical fluke so improbable it would be unlikely to have happened twice in the observable universe.
30年前，生物学家之间流行的看法是：生命的发生源自化学上的偶然。 因为发生的可能性实在太小，在我们观察能力所及的宇宙范围中，不太可能发生第二次。
By traveling, an observer can come into contact with a greater region of space-time than an observer who remains still, so that the observable Universe for the former is larger than for the latter.
由旅游，观察员可以接触到更大的区域空间的时间比观察员仍然还是谁，因此，观测宇宙前大于后者。然而，即使是最快速的旅客可能无法与所有的空间。
The way out of this, for those unwilling to invoke an intelligent creator, is to allow that the observable universe is just one of an indefinite number of universes, each with its own laws of physics.
对于那些不相信有智慧的造物主的物理学家而言，要解决这个让人百思不得其解的立论，就需要令现今人类可观测到的宇宙是不定数量数的宇宙(每个都有自己的物理法则)中的唯一一个。
The way out of this, for those unwilling to invoke an intelligent creator, is to allow that the observable universe is just one of an indefinite number of universes, each with its own laws of physics.
对于那些不相信有智慧的造物主的物理学家而言，要解决这个让人百思不得其解的立论，就需要令现今人类可观测到的宇宙是不定数量数的宇宙(每个都有自己的物理法则)中的唯一一个。
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