Hi to all, another debunking request, if I may. I've heard it said that the shorter the wave used to create a maser/laser the more it spreads out (from high school: 'blue is bent, and brief'). Is that true? What I'm trying to work out is: could you make a really, really straight laser that would get no bigger in diameter than, say 15 metres over a distance of 10-25 light years? I don't have the maths/physics to work out if a laser/maser would be the size of a house or a planet by the time it travelled such long distances. [I'm trying to settle a bet about whether those scorched patterns which appear on the side of our planet from time to time could be 'etched' on using a laser/maser from a VERY long way away. Extra brownie points if you can name the scorched patterns I'm thinking of.] Thanks!