UFO exist

I assume you meant to say that aliens exist, am I correct? I know that unidentified flying objects exist, I see all sorts of things in the sky I can't identify....but it doesn't mean they are aliens. As for aliens existing, i believe they do. However, let's define "alien". Alien, as used in this discussion, would mean any form of life on a body other than earth. I believe in the next 50 years, we will find "life" is fairly common. I believe single celled organisms may be found deep in the soil of mars. I believe that single cell life and perhaps even very simple life forms may be found in the oceans of Europa and Enceladus(a very small moon around Saturn with liquid water geysers). I believe that simple life may be common in the universe. However, when you start escalating that to alien civilizations, especially advanced enough for space travel....I believe these to be very rare. The reason being is that the conditions for life are fleeting in terms of cosmic time. In order for a species to become that advanced, conditions for life must remain stable for very extended periods of time...and such events are rare in the universe. As for being advanced enough to achieve interstellar travel (travel between stars)....well, now you're talking about something that would probably be extremely rare, if at all possible. And the likelihood of us ever encountering such a civilization are almost zero. Think for a minute about the size of the universe and the distance between stars. Our nearest neighbor star is several light years away and it isn't a very friendly star either...the conditions for life on planets surrounding this binary star system probably didn't happen as it is a very hostile system. And the next nearest star is a dozen light years away....then we start getting in to hundreds of light years away...then thousands...then millions...etc. In order to travel that far, a species would have to develop near light speed travel. And to travel between some stars, even light speed would not be anywhere near fast enough as the trip could still take thousands of years. So, while I believe that there may well be other civilizations out there, we will likely never see them or have any way of knowing they are there as they are likely so rare. In fact, it is possible that one may have been somewhat near us (closer than 5000 light years from us) and it could well already have come and gone a million years ago...and we would never have even known it ever existed. Besides, we have no evidence at all that any of these civilizations ever visited us.

I never see UFO but millions have seen them, and in many countries too so yes I believe UFO exist there must be other life forms occupying other planets than Earth you can see ancient drawings on ancient structures walls extraterrestrials have been in contact with our ancestors for thousands of years true I'm not a scientist, but I'm sure the ancients had better things to do than writing tablets and carving things on the wall they wouldn't do that if not because it's important legacy for future generations

great hypothesis, i agree, if there are so many planets so what, would they all be to our eyes, like art?? we already know the universe is intelligent and don't waste space so they HAVE to be inhabitated

I don't know to be honest. There is a good possibility that they are out there somewhere but the answer may never be known. There is no real proof of aliens being around. For all we know all these UFO sitings could be just government testing new equipment or something.