Hello, I was thinking at how we could procuce energy in a simple way, like having solar ovens with mirrors and such devices. This lead me to Archimedes and the way he used to 'toast' roman warships from the Syracuse citadel, apparently that idea was somewhat validated once, they found a way to toast a pile of plywood resembling a roman ship with plates of metals used at the time. Anyhow which lead me to think : what about today ?, suppose we would hypothetically having the same kind of threat but from space : an alien warship threatening to zap humans from existence. What about doing the same thing ? Billion of people using mirrors directly aimed at (more or less precisely) at this alien ship : what would happen ? More precisely, what would be the effect in energy having let's say 100 miilion mirrors aimed at one point in space toward one of those things, would it do the same thing ? Is this feasible, we would have one shot at it. This may sound naive, well is it ? Can someone calculate what output of energy this represent ? Best regards, Simon PLOUFFFE