During the Space Race, the following events occurred:
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Advancements in spy satellite technology - This was significant during the Cold War as both the U.S. and the Soviet Union developed satellites for reconnaissance purposes.
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Improved technology for sending living things into orbit - This included sending animals into space, such as the Soviet Union's launch of Sputnik 2 with Laika the dog in 1957.
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Creation of a landing module that could fly back to the ship in orbit - This can refer to developments such as the Lunar Module used in the Apollo program, which allowed astronauts to land on the Moon and return to the Command Module in orbit.
The other two options listed (development of a rover to land on Mars and design and building of an international space station) are not associated with the Space Race, as significant Mars rover missions and the International Space Station came about later.