Do aliens exist? What is your point of view and why?

I personally believe that life exists on other planets out there. I'm not positive that there's other intelligent life, but I think there's a very good chance--and if there isn't yet, I think it will evolve in the future.

Really, looking at the sheer number of stars in the universe, and knowing that a fair percentage of those stars probably have planets, it seems impossible to me that SOME form of life doesn't exist elsewhere. Whether it's intelligent life or not is another question--intelligence is much harder to do. Look how long it took to evolve on Earth! Some scientists speculate that if Earth were a tiny but less hospitable, intelligence may never have had the opportunity to evolve here. On the other hand, some scientists believe the opposite might be true; if Earth were harsher, perhaps the demands of survival would have required intelligence to evolve here much sooner!

One key problem with the idea of extraterrestrial intelligence has been the lack of radio signals we've found when scanning the night sky. However, an interesting new take on this has been raised by Stephen Hawking recently. He suggests that we actually don't want to make contact with aliens; the might be more advanced than us, and historically contact between advanced and primitive peoples end very, very badly for the primitive peoples. Now it's interesting to note that all our major attempts to pick up signals from alien civilizations have been based on the idea that they, like us, want to be found. We look for signals in the radio bands that are easiest to transmit on over long distances. Scientists had always assumed that aliens wanting to advertise their presence would broadcast on this band. But maybe any alien civilizations out there have come to the same conclusion Stephen Hawking has--they actually don't want to be found, for fear of being conquered by a more advanced race! This might help explain why we haven't heard from any of them.

The question of whether aliens have visited Earth is yet another question. I personally find myself saying no, because of the laws of physics involved. Few people realize just how far apart stars are; even traveling close to the speed of light, it would take decades or centuries to get to Earth from most of the stars in the Milky Way. Aliens more than 200 light-years away would not even known we exist--our earliest radio and TV signals haven't had time to travel much more than 100 light years from Earth since we started broadcasting. To me, it seems doubtful that an alien civilization would find it worthwhile to send explorers across the vast distances between stars, especially knowing that once here, the explorers would not be able to contact their home planet because it would take years to for signals traveling at lightspeed to get back home.

Of course, all of this assumes the lightspeed barrier can't be broken. If another civilization had discovered how to warp space or travel through other dimensions, or even how to use quantum entanglement to have instant communication across any distance, it would make a lot more sense for them to visit us. That's a lot of really bit ifs, but I thought it was worth mentioning. Never assume we know everything about anything.

Yes, I absolutely believe in other forms of intelligent life(aliens). I just think that assuming that we are the only form of life in the universe is very selfish. Why do I believe that aliens exist? well is pretty simple, our solar system is part of a tiny galaxy there are more than 8 billion of galaxies just like ours in the universe thousands of planets that we don't even know about; so how is it possible that there won't be any other forms of life besides us? I have had tow weird experiences too that support much more point of view. The first one happened when I was very little my family and I were taking a walk when a peacefully horse became so crazy and aggressive that even tried to run us over no later than a minute after that we notices a small disk up in the sky that seemed like it was going at a great speed and it was green. We never knew what that was and I was too little to understand but I never forgot. The second experience happened a few years back during summer I was outside my house talking on the phone and when I look up to the sky I see this weird triangle shape that seemed to be a craft; it had three red lights on each side and a big violet/blueish light on the center that was very beautiful and big it was moving at a very low speed I was walking backwards like kind of following it and I looked down like for a second because there was a water host and I didn't want to trip on it and when I looked back up this thing had moved really far I could still see it but it was very far from where it was before I looked down. I run inside to bring my dad outside so he could see it and this thing was gone..He told me that it was probably a plane but that was something else I know for sure. It was very silent and it traveled to a super high speed because there was no way that a plane would move so fast and not make a sound what so ever. Well there you have my opinion and experiences hope they help lol.

There have been math equations pointed to tackle that question from a purely statistical point of view. Most of the "experts" utilizing formulas to predict the existence or nonexistence of life on other planets believe that there are most likely many planets with life on them, which is not to say that alien life is statistically common but, more to the point, there are just so many planets that potentially could support life as we know it. Personally though, I think the formulas and equations used to determine the likelihood of life on other planets are kind of weak considering we don't even know how it formed here. I don't know how you could establish the likelihood of it hapening on other planets if we don't even know how likely or unlikey it was to develop here. To me it seems that, if you remove a creative god from the equation, life forming was EXTREEMELY unlikely and it should come as a suprise that it hapened at all in a finite universe. If however, the universe, or "multiverse" is found to be infinite then because our presence proves that life is possible we'd know mathematically that there are infinite other life forms and even civilizations elsewhere in the distant cosmos just based on probabilities.

The universe seems most likely finite making other life forms unlikely in my, somewhat unpopular, opinion. If the universe is found to be infinite than there most definately exist other life forms, albeit most likely stupendously far away.

Now pay close attention. Not only are the existence of aliens possible, it is a fact that they exist. They have conqured the problems of long distance space travel and have made visits to many solar systems, including ours. Spend a few days in Roswell, New Mexico. Check the research, watch the videos, look at the photos. The evidence is very clear. Aliens have been visiting us for thousands of years.

E.T. exist among us now through fact we are the respond not conflict over petty previous theory structures to regulate society....with worry. We became what we at the instant are, we weren't this way before, we are extra suitable than we predict of. We have been taught to grant away our skill. some E.T.s are helping in our progression in technologies etc. subsequently there is as quickly as lower back yet another wave of evolution for the people. people who're purely being at the instant are not passing judgement, they watch for our re - awakening

Ok, are you asking if there is life "Out there, somewhere"? or are you asking if "they" have come visiting here? Those are two completely different questions.

Life, "Out there, somewhere" is an almost certainty in one form or another. The odds of conditions being unique here to form life, when compared the the near infinite possibilities available in the entire universe make it almost impossible for there to NOT be life out there, somewhere, in some form.

Now, have "they" come here? No conclusive evidence exists to support this. Personally, I think there is enough "incidental" evidence to at least consider the possibility, but our current understanding of the laws of physics does make it improbable.

Aliens must be real because there are the elements needed to create life on Mars,Earth is not the only planet with water :P it sounded better in my brain

It's very likely that life exists on other planets. However, it is not visiting us and never has.

The best case I can make for the probable existence of extraterrestrial life comes as a series of arguments that refute the notion that life on earth is too special and fulfills too many unlikely necessities for life to exist.

First off, let's look at what we know about life on earth and what we know about the universe in general:

1) "Certain elements are needed for life to exist..."

The 10 most common elements in our galaxy (and presumably, our galaxy is a fairly typical galaxy) are Hydrogen, Helium, Oxygen, Carbon, Neon, Iron, Nitrogen, Silicon, Magnesium, and Sulfur. The 6 most common elements in all of the known living organisms are: Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorous and Sulfur. 5 of the six most common elements in living organisms are in the top 10 most abundant elements in the universe (and 2 of the top 10 elements are noble elements, so we could say that out of the top 8 chemically reactive elements, 5 of the 6 most abundant elements in living organisms are represented; also, Phosphorous comes in at around number 16, so it isn't that far off of the list).

So the argument against extraterrestrial life existing due to a lack of the proper "ingredients" is obviously fallacious.

2) "In order for life to exist, the planet has to have liquid water (and water is rare), and it has to have a certain atmosphere, blah blah blah..."

Actually, due to the fact that we're so galactically isolated, we can't state for certain that life has to have any specific conditions to exist.

Extremophiles are a perfect case of life (as Ian Malcolm put it) "finding a way." My favorites are the "Water Bears." (I believe they're called Tautochromes, but I'm not certain) These little eukaryotes can withstand conditions that would liquify, scorch, freeze, and otherwise kill most creatures (including us), and they keep on ticking.

Then there are bacteria that do not metabolize oxygen. I believe that some of them metabolize Hydrogen Cyanide gas deep below the earth's crust. Oxygen kills them (Oxygen is a known corrosive element anyways).

These are just 2 examples of lifeforms that utterly amaze and bewilder our expectations of what life needs in order to survive.

As far as the water thing goes, let's look at the top 3 elements in the universe again:

Hydrogen, Helium, Oxygen

Now, we can logically deduce that the most common molecules would be combinations of these three elements, right? That gives us H2 , He2, and O2 to start with. These are known as diatomic molecules. Now, with Helium being a noble gas, we can rule out it's interactions with any other element as being significant. This means that the next most common molecules will be molecules containing Hydrogen and Oxygen. 2 molecules come to mind: H2O and H2O2, water and hydrogen peroxide. However, we know that Hydrogen peroxide is somewhat tricky to make and in time, 2 molecules of Hydrogen peroxide will break down into 2 molecules of water and one diatomic molecule of Oxygen, so now we have water and oxygen. Not that rare, is it?

3) "Life can only exist in a spiral galaxy like ours..."

There is some legitimacy to this argument. Spiral galaxies are somewhat "cooler" (in the sense that there aren't massive amounts of gamma radiation pouring through the interstellar medium) than elliptical galaxies. However, out of the 100 trillion galaxies in the observable universe (each galaxy having on average 100 billion stars), 60 to 70 trillion galaxies are spiral types. That's like saying a person can't be rich if they only have 70 million dollars rather than 100 million dollars.

4) "Life can only exist if there is a stable star like our sun. If the star is too hot, it'll burn up too quickly for life to evolve, and if the star is too cold, it won't send enough energy to the planet to cause the chemical reactions necessary for abiogenesis, and eventually life."

Which is why it is nice and fortunate that 7% of the stars we have observed are medium yellow stars, like our sun. What's 7% of 70% of 100 trillion multiplied by 100 billion? A hell of a lot more than 1, I can tell you that much.

So, those are the top 4 arguments against extraterrestrial life that I can think of, and they're not very good ones. Do I believe in extraterrestrial life? Yes. Do I believe that aliens travel billions of light years to mess with midwestern farmers / Acid-freaks / Lonely Cat Ladies... by kidnapping them and anal probing them? No.

Am I certain that no aliens have ever visited us? No. To be quite honest, given the hypothetical concepts we are coming up with right now (such as bending space-time to allow for the creation of wormholes that will allow for FTL travel), I have to consider the possibility that somebody else has beaten us to the punch. But without actual proof of alien visitation, I can't say that such a thing has actually happened..

The universe is big and there might be totally different kinds of life.

So I am pretty sure there are other lifeforms out there.