The most important obstacle for alien contacting with earth, be it RF, EM or whatever type of communication form is distance. As if alien is also subjected to current what law of physics current we have, it needs ten of thousand or hundred/million thousand of light year to send a signal to earth, while spotting earth in the vast universe is no different than finding a needle in a big deep ocean.
Human kind has how many of history, much much less than that. Human kind existing period/history is not enough for sending or for the signal to reach earth what's more is that finding a tiny earth in the universe.

So chances are very very slim even if there is alien out there.

I don't think distance is that big a deal la bro, especially if u look at it from a galactic scale of space and time.

The Milky Way is what, 100,00 light years across? Lets assume that whatever hypothetical bunch of aliens we are looking at here do at some point use radio frequencies for communication. In vacuum, radio frequencies move at essentially the speed of light. Safe to say it takes RF 100,000 years or so to get from one end of the galaxy to another. The Milky Way is at least 13 billion years old. The earth is only 4. A billion years is plenty of evolutionary time to allow space faring civilizations to populate and spread and generally make a lot of noise.

Granted we've only begun to grasp electromagnetic communication some hundred or so years ago. If the aliens still exist, there should be SOME noise at least. Something residual, recurring.

Also, granted, they may be using some form of communication that we have not been able to decipher as yet. Maybe the deluge is yet to come (intergalactic spam! )

But I honestly feel the galaxy is too creepy quite. What are the odds that out of almost 400 billion stars, ours is the ONLY one that supports life?

Today, our best means of communication is via electromagnetic wave, i.e. the RF and EM you mention. We ourselves know the limit of this type of communication, it is not the most feasible means of communication through space. If alien do exist, what are the odds that they will be using this slow communication? Either they don't transmit at all (due to slow transmission speed), or they are using technology too advance which none of our device could pick-up. It's like using a morse-code device scanning for RF signal.

We limit ourselves that the current speed limit is lightspeed because the current science discovery say so. I like to emphasis again, that wormhole is another likely way of travelling faster than light.

Cherenkov radiation indicate electrons can move faster than light. I'm sure some idiot out there must've done the math and figured FTL travel.

On aside note, i must really have nothing better to do to be coming up with this rubbish at 1 am on a weeknight

To think that we are alone in the universe, it is really creepy. Then again, to imagine that there is a possibility of other lifeform, is equally creepy.

To imagine other lifeform in other planet or galaxy which is identical to human built (head with brain, a pair of eye, body with 2 arms and legs) even creepy/weird.

why in most ufo cases must be accompanied by military presence and cover ups?

ever wonder y all the description is the same.. flying saucer, big eye, big head, small body.. why isnt there other description?

because UFO conspiracy theory people dont have a good imagination, why should alien look like life form on earth with eye and limb, if we really meet with alien i dont expect their physical appearance to be anything like life on earth, that is if they have physical appearance.

Erm, this one not that creepy, but I think it feel strange and weird. If they have high similarity to human, including our senses (vision, smell, taste, sound, touch) and intellectual (able to think and express emotion), the FIRST thing I'm going to ask if they believe in existence of God, how does their religious story came about, and if there is similarity in their God and ours.

It's quite obvious, because that is how they look like? But most importantly, are these creature (big eye, head) are in fact themselves, or it is just a droid? We only thought of them as individual of some life-form, but are they? It could be a droid which they use to scout us.

Who define their shape and looks? Who like our imagination.. I hav doubt on the shape and looks part.. arent there other life form that those always shown.. Always the little green martian look.. Y they jus wanna observe us? Y dont they make contact? Y their flying craft is always saucer type? R we just being visited by 1 type of alien? Y us?

We human defined what aliens look like.

Too much assumption were put into imagining how an alien look like. Assumption like they come from a place like earth. Aliens that come from a planets with similar environment will share some characteristic though it's hard to say. It's foolish to assume the mechanics of a human body is perfect for Earth-like planets.

There are many possibilities why they do not make contact with us, these UFOs we saw might just be a robotic probe sent by them with no living being on board. Logic dictates long distance space exploration anyway that's why there's no human occupant on board Voyager 1 and 2.

The paranoia of other species capturing their technology, reverse engineering them and using it back against them is another factor.

Saucer isn't the only type of UFO conspiracy theorist claim they saw

Another theory to chew on:
If they (alien) were to create a device to observe us, why create something that looks so different from earth creature? Logically, they should create a device or probe which look exactly like human, so they can hide among us. If not, try other earthly creature, that should blend easily.

There are few theories why they look so differently:
1. The 'thing' we saw is indeed themselves
2. The 'thing' we saw is a fail probe, the success probe is already among us.
3. Alien 'vision' is different than us, they see differently, and hence saw a different version of us. They might be seeing a different realm/dimension (different thing), but created the device in our realm/dimension.

If they're million of light years away. They'll have to wait for a looooooooooooooooooooong time to know how we look like.

Remember we're talking about the law where there's is no FTL travel.

And maybe by the time they arrive on earth, we looked different

So say, the alien saw the dinosaur, and created T-rex to land on earth to observe us, but after millions of years of travel, dinosaur became extinct and human dominated. Oh wait, maybe that's how Jurassic Park come about?

This post has been edited by SeaGates: Jul 5 2009, 12:28 AM

My doubt is still toward.. Y observe but made no contact? Or jus like wat has been said that they r already among us ...well the truth is out there

how about the idea that this universe is a simulator run by some super advance Alien? like a Sims game that we like to pay so much.

A few facts and possibilities:
1) UFO aren't always 'flying saucers' type. There has been many shapes of cigar/cylinder shaped objects and other with lightnings and fireballs with no definite physical appearence. There are videos and photos on the web of some of these.

2) Few reason they don't make contact and observe only:
i) Ever watched Star Trek? You'll be familiar with their Prime Directive of non-interference with Civilization that is not yet capable of space faring. Maybe to them, we're still not there yet, thus they'll not show themselves to us yet.

ii) The US gov and other major powers are aware and in contact with these Extra Terrasterial Life forms. And are in technology and information exchange with them.

iii) They have evil intentions and plotting a sinister plot to destroy or enslave us all. Perhaps something is holding them back now...maybe the 10,000 Starship Class Destroyers is still 500,000 million light years away and they're just waiting for backup....

what you guys think?

Its true. These "projects" are all heavily guarded in areas like Area 51. They basically never reach us normal people because everything is covered up. Occassionally, there are test flights of captured UFO saucers in Area 51. Bob Lazaar, is the man. He even predicted that the US military in Area 51 was going to do a test flight of a captured UFO at a specific time and date. And it actually occured.

Wow ! Incredible ! Look at 4:38.... One of the best pieces of footage ever!

This post has been edited by defaultname365: Aug 3 2009, 06:56 PM

UFO does not exist, they are the creation of certain secret society just to deviate the society from whatever sick thing they are doing...just my not so humble opinion !