Earth is believed to have formed into a terrestrial planet 4 . 56 billion years ago when swirling space debris and gas clumped together 当成漩涡状太空碎片聚集在一起的时候,地球被认为在45 . 6亿年前形成。
Livio ： when we look back in time ， using hu le ， we can see the universe ， how it looked when it was le than a billion years old 里维奥：我们用哈勃望远镜回顾过去，能看到宇宙在差不多十亿年前的样子。
Then a cataclysmic impact with the planet spewed molten matter into space - from which the moon was forged 一班科学家，带你返回四十五亿年前以前，把地球的诞生浓缩比喻为二十四小时，内里有什麽事情发生？
In other words , we are seeing the universe 380 , 000 years after the big bang , or over 13 billions years ago 根据理论推算，这个转变发生在大爆炸380 , 000年之后，换句话说，图中所显示的是超过130亿年前的宇宙。
The starting point for both kinds of theories is the big bang , the explosion with which the universe began 10 billion to 20 billion years ago 这两种理论的出发点都是大爆炸? ? 100至200亿年前宇宙开端的爆炸。
The objects are considered fossil remnants of the swirling disk of debris that coalesced to form the solar system roughly 5 billion years ago 柯依伯带被认为是50亿年前形成太阳系的原行星盘的古老的残留物质。
The moon ' s heavily cratered surface is the result of intense pummeling by space rocks between 4 . 1 billion and 3 . 8 billion years ago 月球的麻子脸是41亿年前“星球”大战的结果。当时宇宙中大批石块与月球相撞。
