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Astronomy or Space Exploration

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What words does the author use to emphasize the concept of outer space as an eternal frontier?A. all that has gone before was
1. 10 answers
2. asked by Chill
3. 1,373 views
Jules Verne in 1865 suggested sending people to the Moonby firing a space capsule from a 220-m-long cannon with a launch speed
1. 2 answers
2. asked by aRd
3. 1,098 views