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  1. Yuri Gagarin: Facts about the first human in space | Space

  2. 人类首次太空飞行60周年 - Star Walk

  3. The first space walk happened 50 years ago, and ... - The …

  4. The First Spacewalk - BBC

  5. 尤里之夜2019 - Star Walk

  6. Yuri Gagarin | Space

  7. Gagarin’s March: 60th Anniversary of the First Human in Space

  8. Apollo 11: The Moon Landing - National Air and Space Museum

  9. Yuri Gagarin | Biography & Facts | Britannica

  10. Yuri Gagarin: The journey that shook the world - BBC News