Is that "no mass" (whatsoever, period)... no rest mass... or no relativistic mass? [i've never measured either of those... which one(s) have you recorded? ]
Anyway, we're getting into wave/particle duality now (as well as mass/energy equivalence), and so, okay... perhaps 'matter' wasn't the most perfect word [which is why i generally favor the less technical term "stuff".] But thank goodness we got you back on a science track here.
So that still leaves my original question completely unanswered however (except for the Star Trek sci-fi "warp 9" response by ...JER. Good one!).