I've been playing KSP for a whole now but I've just decided to try my first probe fly by of a planet. What I need to know and that no other thread seems to answer exactly is: if I do science with a probe and transmit the data back home, I only get 40% of the science max. But! Of that 60% that didn't get sent, is it gone forever? Can I use a lab to reset the experiments and then re do and re send them for more science? Or can I land and return to kerbin after the transmission to get that 60%? By sending data am I permanently sacrificing that 60%?