You need to wait for an exotic orbital goods trader to have one in stock. Alternatively you could spawn one in with devmode if you don’t mind a little tweaking. :P

There are also mods that you can add a building recipe to them to obtain them without devmode. What I did since it simply makes sense after spending so much time researching to make them. Could probably add a config option for that at some point so player don't have to jump through hoops like I did