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The Earth, as far as we know it's the only home to life in the universe.
地球，据我们所加，全宇宙只有它有生命。
So what makes our planet so special?
是什么让我们的行星与众不同？
To find answers, we must travel back in time.
要找出答案，我们必须回到过去。
See the first humans walk the Earth.
目睹人类始祖行走于地球。
Ride each colliding continent.
跟随大陆相互撞击。
Face killer dinosaurs.
面对杀手恐龙。
Dive into oceans full of bizarre life forms.
潜入满是怪异生命形态的海洋。
Feel the bitter chill of global ice ages.
感受全球性冰河时期的酷寒。
And experience the fury of cosmic missile attacks.
体验宇宙飞弹轰炸的狂暴。
By travelling back in time,
唯有回到地球诞生之初，
we can piece together our planet's incredible story.
方能拼凑出这颗行星惊涛骇浪的故事。
And discover why all of this, and all of us, are here.
发掘芸芸众生如何出现于斯。
The journey starts almost five billion years ago.
我们的旅程开始于近50亿年前。
There's no sign of Earth just yet.
那时还没有地球的迹象。
Only the Sun, a newborn star surrounded by dust.
只有新生的恒星太阳被尘埃包围。
The Earth hasn't formed yet.
地球甚至尚未成形。
But through time, gravity pulls the dust into tiny rocks.
让时间快转，即可看见重力把尘埃聚集成小岩石。
