Alan Shepard
Yuri Gagarin
Neil Armstrong
Nikita Khrushchev
True
False
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4
5
6
7
2
3
4
5
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Neil Armstrong
Michael Collins
Buzz Aldrin
Alan Shepard
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The asteroid belt
Neptune
Uranus
Pluto and the Kuiper Belt
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Sun
Cosmic microwave background
Interstellar cosmic rays
Mercury
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Explorer 1
Mariner 1
Viking 1
Pioneer 10
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1963
1973
1983
1993
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Pioneer 10
Pioneer 11
Voyager 1
Voyager 2
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