I'm writing science fiction that takes place in the year 2040, ultimately I need ideas of what a futuristic space craft would look like. It would only be useful for interplanetary travel within our solar system. It has to land on Mars and be able to exit the planet as well. What fuel source would such a spacecraft use that would man a crew of 6 explorers to explore the caves. Also it needs room to contain probes and equipment for cave exploration. I don't know anything about engineering or rocket science, evidently.