... really? This feels like nothing but unrealistic idealism to me. Wherever we've gone exploring as a species throughout our history, we've left our mark (usually bad). You might dream of a reality where we change nothing at all, but it's just not how things work out in reality. And honestly, leaving a bunch of waste, which is most probably entirely sterilized and cleaner than your kitchen by now, on an uninhabited astral body with no ecosystem or atmosphere, seems a bit less egregious than wiping out local wildlife or cultures.