In the late-70’s to early 80’s there was a tv show about a private company going to space by building their rocket out of trash. I have always contended that the most lucrative space business will not be delivering people to space and beyond but to deliver garbage to space and direct that trash into the best incinerator in the galaxy, the sun. This business would be worth its gold in the weight of the sun. The model would go something like everyday rockets would go to and come back from an orbiting station to which compacts the garbage and is connected to a long chain of space capsules headed toward the sun. Since the first one will need to be propelled, the second and subsequent capsules would not be as they would be using the energy of the first to move toward the sun. This train type of system would be costly in the beginning but would become more inexpensive as time went along. This would reduce the need for garbage dumps and the like. There would be plans for contigencies in case a mishap were to occur. The first company to develop and realize this model would be beyond rich.