How can you so definitively say NO aliens are not visiting us?

Orzoff,i see you are dealing with a little close minded "science" guys.

Opinion of Dr Dave is strictly scientific and delusional where he says why would some alien race come to this little spec of dust and observe it?Because they would definitely do that.Like we would when we get more advanced.I respect science and only speaking when there is evidence,but you need to open your mind a little and see how many possibilities there are.We are civilization who is only a few thousands of years old.And we only space in 60s.We are basically 200 old civilization with tehnology.There must be other alien races who are millions and millions year ahead of us.

Here is why.Law of the Universe is evolution and constant change and activity of energy.We know that from simpliest form of life come animals and then intelligence which we are today.Similiar things are happening on other planets.Just imagine how ignorant it would be to say that Earth is so special.We are just a little little part of all other perfect hostile planets where there are also civilizations.

Civilizations are rare in the Universe because it needs billions of years and a lot of luck to life evolve into intelligence.Or maybe on all other hostile planets are happening very similiar things and there are hundreds of thousands of civilizations just in our galaxy?Many of them will never go to space,and very few will become unimaginable advanced.

Just only 1 very advanced alien race can observe whole galaxy.They just build few millions of intelligent ships and send them in every direction.

There are probably few hundreds of these civilizations and probably the whole Milky way is observed.

These civilizations dont waste time to observe planets all day.Intelligent ships who can fly on their own and collect data do that.

My opinion is that our planet is definitely observed.Its very important for other civilizations to know what is happening on other planets.Just imagine that some evil alien race come incredible advanced and star destroying other life.For that reason there are the keepers of the Universe.Universe is a holy thing and its monitored by advanced beings.

This is of course speculation,but a logical one.

Our civilization is just a product of the Universe,which means that many other products are there.

Universe is the One which means that similiar things are happening out there.

Here's what we know. According to this site, ( http://exoplanets.newscientistapps.com/ ) there are 15-30 billion planets in or galaxy that are roughly the same size of earth, that exist within its stars habitable zone. I'm sure thousands, maybe even millions have developed complex life. But let's be realistic, most of them probably are either really far behind us, or extinct. I don't think that it's a rediculous to guess that that are a couple hundred planets that currently exist in our galaxy to develop life, are space fairing, and many may be far more advanced. I think it's almost impossible that no other place has developed life as smart as or smarter than us. But it is still possible.

But here's the "negatives." The voyager 1 is the farthest reaching man made object. It is currently 127 AU away from the earth, or 1.9x10^10 Km. That may sound like a lot, but it's not at all. a light year is 522 times larger than that. The closest star is 4.24 light years away, or 2216 times that voyagers traveled distance. This means it would take voyage 1 almost 80000 years to reach it. Why am I talking about our tech? Because every alien life would be operating under the same laws of physics. Our laws show that going the Speed of light would take an infinite amount of energy. If you want more explanation on how this speed limit is in place, watch this video http://www.youtube.com/watch?v=EPsG8td7C5k. It is truly not possible... by conventional means. There theories out there about the development of a warp drive. The warp drives maximum speed would be about 10 times the speed of light. YAY! we can now get to that star in just under 6 months. Most stars that could develop life would be farther away. Also, this would take A LOT of energy. About 65 exojoules, or the US annual enrgy consumption to create a warp bubble. There's also the fear that stopping it could end up annihilating the solar system its in. And starting it would probably also be worrisome. Enough that we would want it to be far away from us before it makes the jump, adding even more time. So let's assume, it doesn't annihilate when it reaches it's destination, the aliens can find a conventional source of energy, they get through every hurdle I just mentioned. Now they have 15 billion planets to look at, and they need to decide which one to go to. There is no possible way they would know which ones have life, because of the way magnification with telescopes work (the higher the zoom, the bigger the mirror has to be) meaning the mirror might need to be as big as the planet itself to actually create a good enough image. If you also look at the site I listed near the beginning, you'll also know that our planet would have to be at almost a perfect angle for them to even notice it. So, if they miraculously see our planet, all they'll know is that it's about the size of theirs, and within the habitable zone. Sure there is possibly other things they can test, but who really knows. So, now you're telling me that you think a random alien civilization is going to take a shot in the dark the is the equivalent of 1.208 trillion dollars (probably more).

So if they somehow get through all of this, there's also the fact that it's unlikely any person has ever seen evidence of one. So, yes, I think aliens exist, but I also think it's really unlikely they've been to earth.

And now I'm almost regretting answersing this. After reading your responses to some of these poeple, it's clear they only answer you want is yes. Even though it's not realistic. I did have a lot of fun with the research though!

I don't think anyone is definitively saying this... just that there's no evidence of it. My own reason for not believing there's any aliens on or nearby our planet is the difficulty in getting here. While those problems may have been solved by another species - there's no denying we have much to learn - I simply doubt the validity of the claim. I have no proof either way; but recognizing the difficulty involved - simply doubt it.

Could I be wrong? Sure I could. I'm wrong a lot (Just ask my wife!). But, since all anyone can offer here is opinion on the matter.... mine is that we have not been visited.

Because of the simple vastness of outer space. How would they know we are on this planet? If they are within 100 light years, they might've detected our radio broadcasts but that's a very small volume compared to the vastness of the Universe. They would basically have to just accidentally happen upon us. The distances they must travel are enormous, regardless of how advanced their technology, it would still take more energy and time than going to the corner grocer, so why would they come here, one planet out of hundreds of billions. Any resource they might want would be available from asteroids, comets and moons much closer to them and we've already established that they would not know of our existence. There simply isn't a logical reason for them to have visited. Sure there's a remote probability but your chances of winning the Powerball ten times in a row are higher. It's appropriate to that they have never visited just as it's appropriate to announce the discovery of the Higgs Boson at the 5 sigma level. Continuing to say that it's still possible is just wishful thinking.

Note, from our perspective, the probability that you're not real is orders of magnitude higher than the probability of the Earth having once been visited. So is the probability of apples not existing.

Answer a question of mine.

I know that there are subterranean Anthropes living in caves that go straight down into hollows several miles deep. They live there as enough water collects there & there is a lot of fauna (wild life) there as well as some plant life higher up from where they are. I can even make some videos (not at all difficult). Believe in that ! (& in me).

Next such thing for me will be to explore a man-like species with the brain of a Dolphin at 3000 feet below in the sea. they speak their own language and have even letters that they inscibed on sea leaves & grasses. Care to loin me & to come with me?

All proper scientific inquiry starts with a null hypothesis. We start with the assumption that there is no difference between our test group and our control group. We then must accumulate enough evidence to reject that null hypothesis and show that, yes, there IS a statistically significant difference between those groups. For example, when testing a new drug, we start with the assumption that the new drug is no better than a placebo. We then must accumulate enough evidence to show that the drug DOES work better than placebo and reject our null hypothesis.

That's the way all proper science works. So we start with the null hypothesis that there are no aliens. We then must accumulate enough evidence to reject that hypothesis and prove there ARE aliens. Thusfar, there is no compelling evidence. There is speculation and there is a high statistical liklihood that alien life exists -- but none of that is EVIDENCE. Speculation is not data. Plausibility is not data. The plural of "anecdote" is not "data." The null hypothesis does NOT say that it isn't possible. But possibility is not data either. The null hypothesis only says that there must be enough evidence to reject it.

You mentioned the law degree so you have some familiarity with the rules of evidence and what constitutes proper evidence and what does not. In court, the mere possibility that someone was capable of comitting a crime is not evidence they actually committed it. Just because you drive the same model car as witnessed at the scene of the crime, are about the same height as the suspect, and live within a few miles of the crime does not make you guilty. All of that may point towards you as a possible suspect, but it is not evidence that you actually committed the crime. You are innocent until PROVEN guilty -- that is, we start with the null hypothesis that you have committed no crime and must prove by the weight of the evidence that you did.

Same thing with aliens. While there is some circumstantial evidence that they may exist, that isn't good enough for the jury. The null hypothesis does not have enough definitive evidence to reject. Until there is enough conclusive evidence, the null hypothesis stands.

There is not a single shred of evidence, anywhere, anytime, anything. Not a gum wrapper, not a loose screw of alien manufacture, not a body, not a blood smear, no technology or art that can't be shown to be human in origin. Nothing. Ever.

I'll add, in reading some of these well reasoned answers, that there's no need for any of that, or the arguments in the question, either. All of those are mental gymnastics and sure, that can be fun. It's just that it's all made up - it's true, real fantasy and in truth all of this nonsense began after sci-fi found it's legs. There is simply no evidence to even think the thought, and there's nothing to argue about.

You answered your own question. WE'RE educated. YOU aren't. I agree with A and B. NOT a chance of C. Why would an intelligent race travel to this little speck of dust when the inner galaxy is where the action is? I seriously doubt you have a clue how small this little mud ball you live on even is. Please explain your idea on why they would come to this little orb when every resource available here abounds elsewhere in the galaxy.

Edit: Disrespectful is posting your delusional ideas in a category that deals with facts and scientific backing. I see none of this in your questions. We don't make assumptions on pure speculation and not a drop of truth. When you have some actual evidence, stop back in.

Edit: And where does an education in law fit in this category? Let me rephrase it to you then. You have NO education when it comes to science. Do yourself a favor and read up on Occam's Razor. You might learn a bit about science and how it works. You may be educated in law but haven't an iota of common sense. Remind me not to hire you as a lawyer if I ever need one.

Its simply a matter of proof.

There is no proof of any kind that supports the claims that aliens have been to Earth.

Its certainly possible they have been here, but without evidence that is simply a claim not reality.

It is very possible there is life on other planets - that does NOT automatically mean that life is intelligent or that it has been to Earth.

I don't understand why anyone with half a brain would think that aliens would travel trillions upon trillions of miles to get here, decide to hide their presence from us for some reason, yet forget to do things like turn off all their blinking lights.......or just not fly around in broad daylight. I mean when we send military aircraft somewhere we don't want them to be seen they turn OFF all their flashing lights, and they go in at night.

Though even if you do actually have a law degree I don't know what that has to do with anything. A law degree is by far one of the least relevant areas of study to this topic.

The key word here is "Educated".

Life does exists out there some place.

But ET traveling through space and visiting Earth> Sorry but that is pure science fiction.

An Educated person KNOWS that this is quite impossible.

The key word here is Distance.