Its in the DNA of we human beings to explore new places. Since ancient times, we have travelled from one place to another, one topology to other, one continent to other, across far fetching seas and highest mountains. We hardly have left any part of this planet untouched. The last century we put our legs on the nearest celestial body to our planet, the Moon, and at present we have been visiting many other planets in the solar system with the help of probes and satellites.