4%. --- This is our understanding of the universe.
The other part of the universe consists of "dark matter (暗黒物質)" and "dark energy (暗黒エネルギー)" whose natures are not yet known. The dark matter played an important role to form the galaxy (銀河), stars and ourselves.
Let's talk about the dark side of the universe over nice coffee and snacks.
※日本語による説明もあります。
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リンク
[1] http://www.h.kobe-u.ac.jp/sites/default/files/general_event/scishop_20160603.pdf
[2] http://www.h.kobe-u.ac.jp/ja/node/1515
[3] http://www.h.kobe-u.ac.jp/ja/node/3834