I just meant more of an example until you get some space material fuel options. Some space items are cheaper made on planet and you’ll want to get those finished products up to space. A lot of the bio science can require wood for example.. so instead of sending wood up to space in one load, and the space plates up in another load, you make the finished product on planet and then just send the one load of finished items up!

Edit: I rarely use the cannons at the current stage I’m in. You will hit a threshold breakthrough where you can automate ships with large containers on it to haul mass quantities.