暗物质究竟是什么目前还是一个谜。一种猜测是它是一些尚未被发现的基本粒子，约13亿年前宇宙大爆炸时产生的一些遗留物。
What exactly dark matter is remains unknown: the big bet is that it is some as-yet undiscovered elementary particle, some relic of the "big Bang" that created the Universe around 13 billion years ago.
弗里德曼方程派生自爱因斯坦的广义相对论。这两个方程式描述了整个宇宙的生命历程——由宇宙大爆炸时的暴烈到不断加速膨胀后的死寂。
Derived from Einstein's theory of General Relativity, the two Friedmann equations describe the life of the entire universe, from fiery Big Bang birth to chilly accelerated expansion death.
人们认为137亿年前在创造宇宙时所发生的大爆炸所产生物质和反物质是等量的，因此它们应该全部地彼此相互湮灭，所遗留下来的宇宙应该什么也没有。
The Big Bang that created the cosmos 13.7 billion years ago should have produced equal parts matter and antimatter, which would have annihilated, leaving the universe barren of either.
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