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Which of the following is most responsible for the success of modern day space missions? invention of the telescope acceptance of heliocentric theory development of liquid propulsion systems discovery
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Which of the following is most responsible for the success of modern day space missions?

invention of the telescope
acceptance of heliocentric theory
development of liquid propulsion systems
discovery of red shift by the Hubble Telescope

User RasmusWL
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2 Answers

3 votes
The third one development of liquid propulsion systems
User Aholt
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C. development of a liquid propulsion system is the answer

User Summer Jinyu Xia
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