The universe is enormous. If life appeared on our blue planet, why not somewhere else? Do not confond extra-terrestrial and UFO(Unindentified Flying Objects).
Scientist consider this subject as serious. Some exoplanets are located in a zone where liquid water is possible. Water is important for life. But maybe aliens life on worlds that doesn't look like our planet. But they are maybe intelligent. Maybe there have a better technologie than us. They maybe searching for life just like us!
