<|im_start|>user
What were the key events in the history of space exploration during the 20th century?<|im_end|>
<|im_start|>assistant
| Year | Event                                   | Description                                         |
|------|-----------------------------------------|-----------------------------------------------------|
| 1961 | First Human in Space                   | Yuri Gagarin orbits Earth aboard Vostok 1.        |
| 1969 | Moon Landing                           | Apollo 11's Neil Armstrong and Buzz Aldrin land on the Moon. |
| 1975 | Apollo-Soyuz Test Project              | First international human spaceflight mission.     |
| 1986 | Challenger Disaster                    | Space Shuttle Challenger explodes shortly after launch. |
| 1998 | Construction of the International Space Station | ISS assembly begins with Zarya module launch.   |<|im_end|>

<|im_start|>user
What were the key events in the history of space exploration during the 20th century?<|im_end|>
<|im_start|>assistant
| Year | Event                                   | Description                                         |
|------|-----------------------------------------|-----------------------------------------------------|
| 1961 | First Man in Space                     | Gagarin goes into space.                           |
| 1969 | Man Walks on Moon                      | First man on the moon.                             |
| 1975 | Space Mission                          | A joint mission between USA and USSR.              |
| 1986 | Shuttle Explodes                       | A shuttle had a problem.                           |
| 1999 | Space Station Built                    | International Space Station completed.             |<|im_end|>

What were the key events in the history of space exploration during the 20th century?