Trial of strength Understanding the structure of the universe is a long-standing dream of astronomers. In the past our understanding of cosmic structure was based on little more than theoretical speculation. Before 1990, it was difficult to test the plethora of cosmological theories being put forward by a growing number of brilliant theorists.
了解宇宙結構是天文學家長久以來的夢想，過去對宇宙結構的認識多由理論推測，一九九○年之前，天文理論進展飛快，但在公式上推來推去，雖產生不少理論大師，卻難以驗證。