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宇宙呢個名源自「上下四方曰宇,古往今來為宙」。「宇」係空間嘅意思,「宙」係時間嘅意思。宇宙即係時空組成。
喺大概138億年前,當時嘅宇宙重細過針頭,密度超高,溫度高達100幾億度,之後發生咗大爆炸,高溫嘅物質冷卻落嚟,密度亦都開始降低。
大爆炸後2秒鐘,喺100億度高溫下,產生咗質子同中子。大概過咗幾分鐘,產生咗氫原子同氦原子。喺再之後1萬年,散落喺空間嘅物質開始局部嘅聚合。
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