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Seriously, I will never believe in UFOs as space aliens.

What, have you blown a plasma conduit?

Advanced military aircraft, yes. Superior beings from another planetary system, no.

I can see that it's virtually impossible for other sentient life to exist in our solar system...

BUT!

Having seen the Hubble Telescope's photos of Trillions of other Galaxies, the odds increase exponentially that somewhere out there, another intelligent life may have emerged and developed space travel....before us.

If so....they're probably also smart enough to have avoided our detection.

I cannot explain every report UFO story posted on the Internet, but I believe others can.

I'm not saying it's aliens but....

Seriously, though, I do have some observations on this. To the extent of being a science geek, my favorite subjects are the possibility that we are ALONE in the universe, and anything about the ice ages. To explain how we might be alone, we have had a number of scientist already explore this.

First of all, we have Astronomer Frank Drake, who came up with the famous Drake Equation in 1961:

Drake was trying to come up with a solution to the famous Fermi Paradox, which basically is, "If there's intelligent life out there, then where are they?".

Some observers believe Drake's Equation is still compatible with observations due to the anthropic principle: No matter how low the probability that any given galaxy will have intelligent life, the galaxy that we are in must have at least one intelligent species by definition. There could be hundreds of galaxies in our galactic cluster with no intelligent life whatsoever, but of course we would not be present in those galaxies to observe this fact.

Enrico Fermi assumed the existence of only one extraterrestrial civilization capable of intersidereal travel (at a speed lower than the speed of light). He assumed that this civilization would be interested in the conquest of the Galaxy and that it progressed by jumps, colonizing a planet during a few hundred or thousands years, then sending tens of vessels towards new conquests. The problem is that after only a few million years, the whole of the Galaxy is under the influence of this extraterrestrial civilization (the low rate of travel being largely compensated by the exponential increase of the vessels number).

Simulations of an expansion show that it is possible for one civilization to colonize the whole galaxy in about 10 million years, a short time compared to the age of the Galaxy (ten billion years). The question then arising, and famously formulated by physicist Enrico Fermi in 1950: since only one extraterrestrial civilization could spread in a relatively short time, how is it possible that that we never saw the extraterrestrial ones and that our radio telescopes never collected signals of suspect origin?