On: NASA presents evidence that microwave thrusters se...

[Natsu]

Makes me wonder if it could somehow convert the energy to mass and throw that off, as it were. Though it's probably something more exotic, assuming it's not an error of some type.

[marcosdumay → Natsu]

"Convert energy to mass" does not make much sense. If you throw light away, it'll propel you.

[Natsu → marcosdumay]

I was thinking electrical energy, but you raise a good point that photons have momentum.