![Voyager 2](https://www.astronomycast.com/wp-content/themes/WhosWho/timthumb.php?src=http://www.astronomycast.com/wp-content/uploads/2010/06/voyager2.jpg&h=150&w=150&zc=1&q=100)
Many of the modern ideas in astronomy happened in just the 20th century: dark matter, the Big Bang, inflation, quasars, black holes. So many discoveries in one important century.
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