Light doesn’t travel through space. It propagates through space.
“Space” has certain properties like permittivity/permeability that allow light to propagate only at certain max speed that we all well know. Actions/reactions (electro/magnetic and vice versa), keep light propagating even for good - if the environment is superconductive.
These properties of space also tell light to propagate straight - if the space is homogenous.
If it is not homogenous - light can eventually bend.
As everything is made of waves, this can possibly also contribute to the mechanism of gravity.
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