A Stellar Engine wouldn't actually have physical engines strapped to its surface. As per the wiki entry:
Such an engine is a stellar propulsion system, consisting of an enormous mirror/light sail—actually a massive type of solar statite large enough to classify as amegastructure, probably by an order of magnitude—which would balance gravitational attraction towards and radiation pressure away from the star. Since the radiation pressure of the star would now be asymmetrical, i.e. more radiation is being emitted in one direction as compared to another, the 'excess' radiation pressure acts as net thrust, accelerating the star in the direction of the hovering statite. Such thrust and acceleration would be very slight, but such a system could be stable for millennia. Any planetary system attached to the star would be 'dragged' along by its parent star.
Now obviously, such a method of travel would normally take millions of years to achieve any significant momentum, but this is a science fiction setting with giant robot cuttlefish, telepathic alien space babes, and an element that can increase/decrease the mass of an object with nothing but electricity. It wouldn't be too much of a stretch; no more than convenient wormholes, or a complete reverse engineering of Reaper tech at any rate; and it would have the benefit of being based on some real world theories instead of space magic and macguffins. (IMO)
Just say that massive generators are able to generate a Mass Effect field capable of allowing the star and it's surrounding system to move at near luminal velocities.
Interesting! I admit that even with the wiki schema I still have trouble envisioning what it'd look like,but that's an interesting challenge, design-wise. I'm not bothered with the perspective of a travel lasting several million years. I don't think we're ever coming back anyway. I still think sleeping pods would conserve supplies and help avoid more... social problems. 2.5 million years (at best) is a lot of time to be basically stranded on one planet with species you don't necessarily get along with.
I quite like the idea of letting relativity do it's thing as well.
Both these propositions do feel more interesting than a freak wormhole or complete Reaper reverse engineering.





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