Accelerating Motion in Space: Virtual Particles?

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In space, a vehicle can change velocity or direction through the conservation of momentum, without the need for a medium. When an astronaut throws an object in the direction of their movement, they experience a reaction that propels them back towards their spaceship. This principle illustrates that engines do not require a medium to operate effectively in space. The discussion raises questions about the role of virtual particles in this context, but the primary focus remains on momentum conservation. Understanding these concepts is crucial for comprehending motion in the vacuum of space.
Joanna Dark
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I'm curious as to how a vehicle might change velocity or direction in space? Do virtual particles act as a medium by which an engine can achieve this? Or does an engine not need a medium and why?
 
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conseravaton of momentum.

If a space man is moving away from his space ship, he can throw a thing in the direction he is moving and he will then move back towards the spaceship due to conseravation of linear momenta.
 

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