translation.en: Now, the Big Bang was an era in the early universe when everything we see in the night sky was condensed into an incredibly small, incredibly hot, incredibly roiling mass, and from it sprung everything we see.
translation.zh: 大爆炸时期是宇宙的早期， 那时候我们现在能看到的夜空中的一切 还是一团极小的、 极热的滚滚的东西， 而从那里产生了我们现在看得到的一切。