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Not only are they moving, but they are flying away from earth at incredible speeds. This was the first real evidence of the Big Bang.
星系們不僅僅是在移動，而且是在以驚人的速度飛離地球。這是支持大爆炸宇宙學的第一個有力證據。
All galaxies on average are moving away from us, and stranger still, those that were twice as far away were moving twice as fast.
基本上所有的星系都在遠離我們，也包括未知的星體。距離我們兩倍遠的星體，以兩倍的速度在退移。
And those that were three times as far away, were moving three times as fast and so on. Everything was moving away from us.
那些距離我們三倍遠的物質，以三倍的速度退移，如此類推。
It became known as Hubble's Law. His discovery is still the starting point for exploration of the Big Bang.
這就是著名的哈勃定律。直到現在，他的發現仍然標志著大爆炸學說的開端。
What Hubble convincingly demonstrated by seeing the motion of those galaxies is that the universe is expanding.
這條定律是哈勃通過觀測星體的退移所得，充分證明了宇宙膨脹論。
Theoretically, an expanding universe must have started from a single point.
理論上說，膨脹的宇宙開始于一個體積小，密度超大的粒子。
By measuring how fast the universe is expanding, astronomers calculated backwards and figured out when it burst into life.
通過測量宇宙膨脹的速度，天文學家計算往后推算，計算出了大爆炸的發生時間。
People ask the question, how do you know that the universe is 13.7 billion years old.
有人會問：你們怎么知道宇宙開始于137億年前。
I mean, smarty-pants, you weren't there 13.7 billion years ago.
我是說，你們是在自作聰明，137億年前你可不在這里。
Well, when you watch television on video tape, you hit the stop button when you see an explosion, and you could run it backwards and see when it actually took place.
不，打個比方，看錄像的時候，遇到爆炸的畫面，按下回放鍵，錄像就會回放，你可以看到爆炸是何時發生的。
The same thing takes place with cosmology. We can run the video tape backwards and then calculate when it all came from a cosmic explosion.
研究宇宙學也是如此。我們可以倒帶回放，然后計算宇宙大爆炸開始的時間。
You don't have to be an astronomer to look back in time.
不是天文學家，你也可以觀望到過去的時間。
If you gaze up at the night sky, you're seeing stars that are millions of light years away, meaning it took the light from those stars millions of years to get here.
凝望夜空，你看到的星星離你有百萬光年的距離，也就是說，這些星星的發出光要經過幾百萬光年才能抵達這里。
So, if you look far enough, you should be able to see the beginning of the universe.
因此，如果觀測得足夠遠，就會看到宇宙的開始。
Named for the ground breaking astronomer, the Hubble Space Telescope allows us to look deep into the universe, back in time and closer to the moment of the Big Bang.
以這位河外天文奠基人物命名的哈勃望遠鏡能幫助我們深入得窺測宇宙，回望過去的時間，越來越接近爆炸的瞬間。
But for scientists, winding back the clock to the Big Bang was only the first step.
但是對科學家來說，把時鐘撥回到大爆炸只是第一步。
