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In page Mass driver:

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With the proliferation of reusable rockets to launch from Earth (especially first stages) whatever potential might have once existed for any economic advantage in using mass drivers as an alternative to chemical rockets to launch from Earth is becoming increasingly doubtful. For these reasons many proposals feature installing mass drivers on the Moon where the lower gravity and lack of atmosphere greatly reduce the required velocity to reach lunar orbit.[citation needed] Lunar launches from a fixed position are much less likely to generate issues with respect to matters such as traffic control due to its low population and difficulties in lunar air travel.