The * bullet cluster is more than 3000 000 000 light - years away . it formed in the last 100 000 000 years 这种子弹群至少离我们有三十亿光年。它至少形成于一亿年前。
It was early in the archaean era , 3 . 8 to 2 . 5 billion years ago , that life first appeared on earth 它在及早在archaean时代, 3 . 8到2 . 5十亿年前,生活第一次出现在地球上。
Cyanobacteria are an ancient group , and their fossils ( stromatolites ) have been dated at up to 3500 million years old 蓝细菌是一类古老的类群，化石可以追溯到35亿年前。
The rate seems to have reached its peak around seven billion years ago and has fallen 10 - fold since then 这个比例似乎在70亿年前达到颠峰，然后逆转向下，至今已下降10倍。
The trypanosome , which branched from other eukaryotes 300 million years ago , breaks this universal rule 在三亿年前从其他的真核生物分支出去的锥虫，却打破了这条通用的法则。
Looking at these isotopes allows the chondrules to be dated , and they were formed 4 . 56 billion years ago 观察这些同位素可以估算出陨石球粒的年龄，他们是在45 . 6亿年前形成的。
" god did create the universe about 13 . 7 billion years ago , and of necessity he has involved himself with his creation ever since 神的确在约1 , 370亿年前创造了宇宙，出于需要
It is possible that the diamonds all formed 4 . 3 billion years ago , and later got shoved into younger crystals 一种可能是钻石都在43亿年前形成，之后被挤压到相对年轻的晶体中。
The impact that created spa clearly happened after the lunar crust solidified , which occurred about 4 . 3 billion years ago 造成spa盆地的撞击显然在43亿年前月球地壳固化后发生。
The bullet cluster is more than three thousand million light - years away . it formed in the last one hundred million years 子弹状星系团距离地球超过30亿光年。它形成于一亿年前间。
