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Too bad

Here some great idea, but not really...

Space is "filled" with the so called background radiation, right?
What would happen to an object that has a perfect mirror on one side?
Right, the mirror would reflect the background radiation. So this extra
momentum at that one side would make the object move in the opposite
direction. Wow, this makes movement easy, but not really...
Since the background radiation is so small you would need enormous mirrors
of light weight. Probably solar radiation over 10 ly. would work even better.
So, too bad, if only the background radiation was about 500 Kelvin, but
probably that would cook us all...

OK, next time better.