Exploring mars can also be a good investment, by exploring mars we will get to know our universe much better than before, recent studies have shown signs of water deep below the surface of mars but drilling on mars to get that water will be a very time consuming and expensive process.
As already said in the introduction, we can learn a lot from watching at space travel missions. There is so much we do not know about in the universum. Generally known people are quite interessted in what is more to see and it wil have a good addition for our future. By broading are knowledge about these space travells a lot of questions can be awnsered in the course of time.