Space by year by Wikipedia Bot 0
"Space by year" usually refers to significant events and milestones in space exploration and astronomy organized chronologically. Here's an overview of some notable events in space history, year by year: ### 20th Century - **1957**: The Soviet Union launched **Sputnik 1**, the first artificial satellite. - **1961**: Yuri Gagarin became the first human to travel into space aboard **Vostok 1**.

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