Although humans have sent several robots already and we have a very good idea of its red hilly landscape there are many unknowns. The new US$ 2.5 billion robot will focus in trying to see whether Mars had the right conditions to support life.
Mars is smaller than the Earth, has its own atmosphere and is 6 months away for an astronaut to travel from the Earth. Therefore, if something interesting comes up maybe in 2030's we will put a step on it. For now, we can continue dreaming in buying a house and moving into Mars and if you are curious like me you can explore Mars in 3D directly with the really cool downloadable Google Earth program.
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