So because beam weapons are affected by atmosphere, and because Luna has none, and because this playthrough gave it no minerals so I won't be making it my shipyard planet like I usually do, I want to use it for a beam PDC. 2 questions; first what's the distance between Earth and Luna? I want my first PDC to be able to shoot "across" Earth to where the moon would be, and later models to expand on that with better tech. Secondly, is there a button or quick function for determining distance between 2 points?