Also called Explorer 81, it is the sixth mission in the ...
The Kepler space observatory found at 600 light years from ...
Apollo 1 tragedy happened during the test,with the Command ...
Kwangmyŏngsŏng-3, meaning Bright Star-3, is a North Korean ...
Was the first spaceflight in the Vostok program and the ...
The oldest of NASA's three surviving space shuttles, ...
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