宇宙大爆炸，开启了星辰与时间的奥秘。美丽小蜜挑5集免费版

　　The universe began with a massive expansion, billions and billions of years ago, and it continues to expand with every passing second. The idea that the universe, and man's very existence, began with a "Big Bang" is no longer a topic of debate among most scientists--it is essentially taken as fact. How has man come to this conclusion, and how has our knowledge evolved so that w... (展开全部)