How do computer simulations of space travel compared to the reality of actually traveling in space?

What is a Computer Simulation?

> A space simulator is a system that tries to replicate or simulate outer space as closely and realistically as possible. The experience of space flight in a spacecraft is usually part of this. Therefore the difference is that a space travelor is the object that run through or travels in space. When a space simulator is just a machine that test,Estimate an speed of the progress of the space ship  ! its just like Virtual reality seeing things that are not real but it replicates the same !

Hope this helped from my understanding!!

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