Our universe is like infinity. There are about a hundred billion stars like the sun at our galaxy, two hundreds billion galaxies in our universe and maybe there are billions planet that like earth to live. If our universe is teeming with life, why so far we have not met them? Shouldn't the sky filled by another life, and at least we have met one of them now. Where are all of them? This is called as Fermi Paradox. The fact, since forty years ago we had sent radio signal to the outer space with hope that signal answered by something out there. But in fact, there has not been anyone who answered. So, perhaps this is why we have yet to see another live so far. The reason why we have not found another life, maybe because our universe is too broad.. Or maybe, they were all there, but we can't talk to each other. Because the distance between are very, very, very far away among us. Although we can build the outer space ship as fast as light, the ship takes about 4.000 years from the earth to the nearest star from our solar system. If even then there is another life, whether they like us and have the same sense? Are they able to read the radio signal during this time we send? And are we able to know their existence? And if they live in the planet like ours or a place that is really out of our imagination? Then, another possibilities, they know our existence. But they choose to ignoring us. Maybe there imperial galaxies out there who purposefully ignoring us, because they think we are a meatball eater species strange and dangerous. There are probably millions of lives out there. However, the figure is not as we imagine. Maybe they just shaped micro-organisms were only concerned with their environment and do not have the intelligence like us. Or is it life including we basically had the instinct to destroy itself. So that they all end up extinct on their planet before it can explore outer space. Or there may be an alien ruler out there that destroyed the civilization of other aliens, thus making our galaxy is empty. If it's right, then we just wait our chance before eaten by that alien rulers. Although it sounds funny, but they may be among us. Stalking, the goal of which is unknown. Or maybe life in the universe itself is very rare. May be required conditions that are very, very, very special for life to begin somewhere. Or may be we have not met another life because we are the first life. Maybe we really alone in this galaxy. Or even better, our universe. During this time, we were just looking for something that never existed. Yes, it may sound terrible. But this too is a possible answer from the Fermi Paradox. So, this question seemed to make us aware that there are still many things we do not know in this universe. Perhaps, for too long we focus here. And maybe now is the time we make collaboration for something bigger out there. And as usually, thank you.