The 20th century was a pivotal time for astronomy, marked by significant discoveries, technological advancements, and milestones in our understanding of the universe. Here are some key astronomical events from the 20th century: 1. **Discovery of Cosmic Microwave Background Radiation (1965)**: Arno Penzias and Robert Wilson accidentally discovered the cosmic microwave background radiation, which provided strong evidence for the Big Bang theory and revolutionized our understanding of the universe's origins.
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