1. There are some facts about life that are hard to imagine, like the fact that you were once a tiny egg just 0.1mm across.
关于生命，有些事情很难想象，比如你从前竟然只是一枚仅有0.1毫米直径大小的卵子。
2. And in a single ejaculation between 40 million and 1.2 billion sperm cells raced to fertilise that egg.
在一次射精中，有4000万到12亿的精子相互竞争去跟那颗卵子结合，成为受精卵。
3. That fertilised egg eventually became you. And then you became one of over 7 billion people currently on this planet.
那颗受精卵最终成为了你，而你又成为了这颗星球上70多亿人口中的一小只。
4. Even though that number sounds enormous, if every single person was placed in a heap in the Grand Canyon it would barely fill it.
尽管这个数字听上去很庞大，但如果把全世界的人都摞在一起，一个科罗拉多大峡谷就放下了。
5. And that number doesn't compare to the amount of tiny atoms each adult is made up of: Around 7 octillion!
但是70亿跟这个数字相比还是差远了：一个成年人是由7*1000的九次方个原子组成的。
6. To put that into perspective, if you compare an atom to the size of an apple, it's about the same as comparing an apple to the size of the planet.
具体来说，拿原子跟苹果比，就相当于拿苹果跟地球比。
7. It's difficult to get your head around how enormous our planet is. Earth has a diameter of 7,926 miles. And at the equator it has a circumference of roughly 24,902 miles.
你很难想象地球有多大。地球直径7926英里（约12756公里），赤道的周长约24902英里（约40076公里）。
8. Although about 71 percent of the Earth's surface is covered in water, researchers estimate that less than 5% of it has been seen by human eyes. The rest of it remains a mystery.
尽管地球表面有71%都覆盖着水，研究人员估计，人类看到过的只有不到5%，其他部分是什么样仍然是个谜。
9. But our planet is really tiny compared to other stuff in the universe. For example, the sun has a circumference of roughly 2,713,406 miles.
但是我们的地球跟宇宙上其他事物相比，又是何其渺小。例如，太阳的周长有2713406英里（约4366804公里）。
10. 109 Earths could be lined up across the diameter of the sun.
109个地球一字排开，才能达到太阳的直径那么长。
11. Earth looks even tinier compared to the blue Hypergiant "Pistol Star", which is one of the most luminous stars known.
跟蓝特超巨星手枪星相比，地球更渺小了。手枪星是银河系内已知最明亮的恒星之一。
12. And even tinier compared to VY Canis Majoris, the largest known star in the milky way galaxy.
跟大犬座VY星相比，地球就更加微不足道了。大犬座VY星是银河系已知的最大恒星。
13. The diameter of the observable universe is estimated to be 93 billion light years. But the size of the entire universe is thought to be so gigantic that scientists are unable to put a number on it.
我们可观测到的宇宙的直径据估有930亿光年。不过整个宇宙到底大到什么程度？科学家甚至都无法给出一个数字。
这是整个可观测宇宙的红外图像
14. There's no evidence to suggest that the universe has an edge. Even if it does, we'll probably never reach it.
没有证据证明宇宙有边缘，即便有，我们也可能永远到不了那里。
15. But there are still so many unanswered questions about life and humanity on Earth. For example, researchers still don't know exactly why humans dream.
但是在我们的地球上，仍有许多关于生命和人性的问题没有找到解答。比如，科学家还不知道人为什么会做梦。
16. No one knows exactly why humans produce tears of laughter, joy, and sorrow. There are many different types of tears, but emotional tearing is thought to be unique to humans.
没有人知道为什么人会因为喜怒哀乐各种心情而流泪。有各种各样的眼泪，但是只是人类会因为情绪而流泪。
17. And even though time is such a significant part of life, no one can explain when it began or whether it will end. Some believe time is an illusion constructed by humans, and others believe that time existed long before humans recorded it.
虽然时间是生命很重要的一部分，没人能解释时间什么时候开始什么时候结束。有人觉得时间是人类想象出来的，还有人觉得人类开始记录之前很早就有时间了。
18. Our planet has been around for a very long time. Scientists have estimated the age of the earth to be 4.55 billion years old.
我们的地球也存在了很长时间。科学家估计，地球的年龄有45.5亿周岁。
19. And the global human life expectancy of 70 years represents only 0.00001556% of that, so let's make the most of the short time we have!
而我们人类的寿命只有70岁，是地球的0.00001556%，所以让我们珍惜在人间这短暂的一趟吧。
（编辑：祝兴媛）
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