There is a 100% chance that we are not the only intelligent life in the universe. To believe this is arrogant, at the very least.
If you just look at the very size of our galaxy alone, let alone the rest of the vast universe, it becomes very clear.
There are tens of thousands, if not hundreds of thousands, of planets similar to ours, just in our galaxy. That makes the likelihood that there wouldn't be intelligent life infinitesimally small.
It's just a numbers game.
When you look at the numbers, it becomes clear that there is most likely intelligent life everywhere in the universe.
So, why haven't we discovered any aliens? Again, it's a question of the numbers. In this case, the distances involved are enormous, relative to the distances we're accustomed to, here on our little planet.
When you consider the fact that the nearest star, Proxima Centauri, is over 4 light-years away (a distance that would take a beam of light over 4 years to go, at a speed of over 186,000 miles per second), you start to see why we haven't noticed evidence of other intelligent life.
Other people look at the video of the UFO that was video'd by the F-18 pilot and are incredulous that any object could possibly move like that - seemingly without regard to the laws of physics that we know, and, therefore, dismiss it as an anomaly that must have an explanation other than being a "flying saucer", piloted by aliens.
I'd remind those people of the advances in science and aerospace that humanity has made in very recent history. It was only 114 years ago, December 17, 1903, that the first powered flight took place. Only 24 years later, Lindbergh made the first solo transatlantic crossing. Less than 15 years later, the first jets were flying over Europe, and less than 66 years after the first powered flight, men walked on the moon.
So, when you consider how far our civilization has come in only a little over 100 years, you see that it's not at all inconceivable to imagine that alien races, many of which have certainly gotten a HUGE head-start on us, probably have figured out how to get around the limitations of our known laws of physics, and are traversing the large distances of space to reach us. And if they're able to do this, I'm sure it would be no problem for them to conceal themselves from us.
The sightings of UFOs that have happened must be either accidental (possibly failure of whatever "cloaking devices" they're using), or, maybe they don't care that, every once in a while, we see them.
I think there are probably lots of these UFOs visiting Earth. I think the ones we've seen are only a small percentage of the ones that are actually visiting.
They say that if it can be imagined, engineering can come up with a way to do it, and I think that's true. I'm sure humanity will eventually also figure out how to travel to other planets in a reasonable amount of time. However, I'm not holding my breath for it to be in my lifetime.
