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Message: <blockquote data-quote="fuindordm" data-source="post: 2672031" data-attributes="member: 5435">Well, people have theorized about tachyons (particles of negative mass that travel faster than light) and warp fields (configurations of gravitational fields that allow faster-than-light travel while still obeying the rules of relativity locally) in scientific journals.  I don't follow your question, though.  Whether or not we can detect something has little to do with how fast it goes; it has everything to do with how it interacts with other particles.  You're welcome to postulate a particle that moves faster than light and participates only in the gravitational interaction, which would be incredibly hard to detect unless the universe was filled to brimming with them.  (Or maybe we have--who knows, it could be the 'dark energy' that we're hearing so much about these days.)   But the existence of such a thing wouldn't change our understanding of light.There's a lot of stuff out there in the theoretical journals that *could* exist as far as we know, and some of it's pretty wacky.But I would bet all the limbs of my body that we do understand the nature of LIGHT completely.  The theories governing the behavior of light have been subjected to experiments of incredible precision.  Our understanding of gravity may change, but that won't affect the basic features of light--constant speed, redshifting and blueshifting, etc.Cheers,Ben</blockquote>