The whole world and everything beyond is the universe.It is all the stars and planets, the Earth and its planet and animals,you and me--everything.
这个定义是非常简单也非常精确的,说实话,只有吃透了这方面的知识的人才能总结出来。
专业、形象 When did all begin?
什么时候开始的?
Many astronomers think that everything in the universe was once packed together in a small lump.Then about 14 million years ago, there was a gigantic explosion of stuff that they call the Big Bang.
回答这个问题的时候,还用了一幅小朋友吹气球的漫画插图,帮孩子理解宇宙大爆炸 - Big Bang,很形象啊!
准确、客观 Will the universe ever end?
什么时候会结束?
Some astronomers think the universe will just carry on getting bigger as the galaxies speed apart. Others think that the galaxies may one day start falling back towards each other until they crash together in a Big Crunch!