送交者: silxirt 于 2011-11-02, 14:37:27:
回答: 70%-80% of the total matter is in that vacuum, it is called dark matter 由 silxirt 于 2011-11-02, 14:21:37:
It says preview, but on iOS PBS app, you can watch full episode.
I am not expert, but I follow these topics.
Steve might be able to correct me or you.