You know, I am so happy today, because I see a movie about the universe and time, and I learned much knowledge. Now I am sharing you what I have learned, let me give a brief as below.

First you should know a concept 'entropy'. It can explain why the building and house collapse, it shows that the arrow of the time, and it tells that the proceeding of universe is from ordered to disordered, and the fact is nothing last forever, at last everything has gone and there's nothing left in universe, and that's the only 'last forever' of universe, nothing changed for there's nothing till that day, 1000... ... .... ... ....000 years later.

P.S. This is a science enducation movie, there are both English and Chinese words on screen, it is a good try for you to watch it, named 时间的神迹, sorry I didn't find its English name.