I've been trying to get my head around relativity etc and struggling :-( However there's one thing that I can't find much information about at an interested-layman level - gravitational waves. They're described as having a frequency etc (being waves) and travelling at light speed. But if they have a frequency then presumably they can have varying frequencies. What would this mean for a gravity wave? Would it have a different amount of energy? Exert a different amount of pull? Could red shift alter the effect of gravity? What about amplitude - is that fixed? Could gravitational waves interfere with each other? Or am I taking the whole 'wave' thing too literally? Apologies for adding to all the noob questions here, but it's got me stumped! Thanks!