Here's a list of key events in the exploration of space presented in chronological order:
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1944 - The V-2 rocket, developed by German engineer Wernher von Braun, becomes the first human-made object to reach the edge of space.
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1957 - The Soviet Union launches Sputnik 1, the first artificial satellite, marking the beginning of the space age.
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1958 - The United States responds with the launch of Explorer 1, its first successful satellite.
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1961 - Soviet cosmonaut Yuri Gagarin becomes the first human to travel into space and orbit the Earth aboard Vostok 1.
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1963 - Valentina Tereshkova becomes the first woman to fly in space, also aboard a Soviet spacecraft.
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1965 - The first spacewalk (extravehicular activity, or EVA) is conducted by Soviet cosmonaut Alexei Leonov.
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1969 - NASA's Apollo 11 mission lands the first humans on the Moon, with astronauts Neil Armstrong and Buzz Aldrin walking on its surface.
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1975 - The Apollo-Soyuz Test Project marks the first international human spaceflight, where an American spacecraft docked with a Soviet spacecraft.
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1986 - The Challenger disaster occurs, leading to a reevaluation of space shuttle safety (though it's important to note this tragedy happened during the shuttle program rather than marking an exploration milestone).
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1998 - The International Space Station (ISS) construction begins, significant for international collaboration in space.
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2004 - SpaceShipOne becomes the first private spacecraft to carry a human into space and return safely.
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2020 - NASA's Perseverance rover lands on Mars, marking the latest effort in the exploration of the Martian surface.
This list should give a clear chronology of pivotal events in the realm of space exploration.