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Forgive me if this is an over simple question, but is there anything that will slow down a moving object in space. This is assuming that there is nothing nearby, like objects with powerful gravity or magnetic force. Does there exist anything that will cause it to slow?
Regarding an isolated object in outer-space, I think we can assume that the light and particles falling upon it from all sides will be balanced, so in Newtonian physics, nothing should slow it. However, in Relativity, linear frame-dragging will tend to slow it down.
Good point lightarrow, assuming that the traveling object has been accelerated to its relativistic velocity from an inertial frame of reference where the CMBR was uniform.
This is something I am entirely accepting on faith. If light has no mass, how can it impart momentum by simple reflection. Perhaps the wave length of the light is reduced and the diference is converted to momentum of the object [which would be calculated by the increase mass the object would also accumulate as a result of acceleration]. Specifically, light can transmit energy in the form of increased mass and acceleration of that mass.