NASA could sidestep many of the impediments to a Mars mission if they could just get there faster. But sluggish chemical rockets aren't cutting it -- and one group of engineers is rebooting research into an engine last fired in 1972.
NASA could sidestep many of the impediments to a Mars mission if they could just get there faster. But sluggish chemical rockets aren't cutting it -- and one group of engineers is rebooting research into an engine last fired in 1972.
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