rotating mass accelerator in space

rotating mass accelerator in space could be placed near earth and launch spacecraft to mars where it would decelerate by using rocket propulsion or if possible entering orbit to slow down 
another rotating mass accelerator could be placed near mars and launch spacecraft to earth where it would decelerate by using rocket propulsion or if possible entering orbit to slow down 

since there is vacuum in space there would be no friction slowing down rotating acceleration of spacecraft 

rotating mass accelerator would use electricity as energy and would get energy from solar panels 

rotating mass accelerator could be very big since gravity won't be an issue 

probably not a new idea, 
but worth mentioning, 

similar concepts have been alluded to in video games 

some company has built a small vacuum sealed rotating mass accelerator on earth trying to launch small rockets into orbit, 
which seems nice 

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