Existence of aliens has been one of a hottest discussion in now a days. Even though many say that they have seen Aliens, there is not a solid proof about their existence. But in mean time we cannot totally deny the fact that there can’t be aliens in the universe. For denying it totally too, we don’t have a proof or justification. Universe is very big; every tiny stars we see in sky every night may be as much as the size of earth or more than that. In this universe we might have another planet in which people living but the fact is nothing as such has been discovered yet. But in near future we might discover a planet like that, we might see some human race living in it. Any thing that has to be accepted needs a justification or a scientific proof. But as far as aliens are concerned we are not able to give a proper proof or justification. Till then aliens existence cannot be taken into a fact. It will remain has fiction story. But what if we think this way, as we are trying to know about aliens ,why they (aliens) won’t have a same thought discovering human race in universe and come to our planet to see us. If that happens, think of the technological challenge we will face in order keep communication with them . Communication world will really find the challenge interesting to work on. Lets hope to have them with us.