Among us? I doubt it.

Out there? Yep.

Pretty much every star will have its own solar system and a lot of the solar systems will have planets with water, an atmosphere and climate suitable for complex life to evolve. Given the Sun is a fairly young star, it's likely there are civilisations many thousands of years older than we are.

I think if a civilisation has evolved to the point where they have developed interstellar space travel then they are likely to be fairly benign in intent. If they've visited us they've no doubt studied us from a safe distance and decided we're too primative to really be worth getting down and dirty with us. Perhaps they'll come back in a few more centuries when we've grown up a bit more as a species.

I think the Star Trek prime directive seems like a pretty good rule and it's probably in effect.

No,I don't believe in that nonsense. It's no different than believing in a god. lol

Well, I'm convinced!

extraterrestrial life ? - sure

intelligent extraterrestrial life ? - probably not (believed that too at some point, but I read some wiki articles and they convinced me that my initial idea was pretty much bogus)

intelligent extraterrestrial life that at least visited our planet since the beginning of humanity ? HELL NO

Brazil? Im brazilian and I dont know of this. Could you give me a link, please?

Also, can there be aliens? Sure. Aliens our planet right now? Ok.

But I havent seen anything that proves it to me so far.

The possibility is there, just no seeing it right now.

Yes they are real. I seen one while traveling on an airplane when I was 16. Only I noticed it though.

If their wasnt any, it would be an awful waste of space.

Here you go. A link to the recent disclosure law. Mind you this was only a month ago.

http://technorati.com/technology/article/brazilian-air-force-decrees-ufo-disclosure/

Like I said. More and more countries are falling in line with disclosure. But obviously these countries dont have much to hide. It's the US, Russia and China who likely have major UFO info such as recovered craft and what not.  They are all very large countries with top notch surveillance and active nuclear programs.

As for aliens, I do believe they exist but I don't think they live among us. I just think they observe us from above and occasionally land to collect samples.

I also think the so called "Greys" reported from the Roswell incident are what the aliens are. Their resemblance to humans is probably intentional as they are observing our planet. They were likely genetically created/modified as to interact with humans if necessary and adapt to our environment/atmosphere without the need for special gear. Assuming their technology is very advanced it would be an easy feat to accomplish. 

The closest know exoplanet to Earth is 10.5 light years away,  while others have been discovered in the ~20 lightyear range. For an alien species to transverse that distance would require a great understanding of the laws of the physics and super advanced technological development. But who knows where the aliens could come from. There are 100 billion plus stars in our galaxy alone, itself only one of over a billion galaxies in the observable universe. The closest galaxy to our own is the Canis Major Dwarf Galaxy which is 25,000 light years from Earth. The scale and scope of the universe is vast. Anything could be out there.

Thanks for the link. Byt its really more of a: "hey, we have this weird ocorrencess going on and we dont have the capacity nor the resources to study it, so everyone take a look and see what you can find."

I dont think it will really do much since all the UFO researchers already have a ton of similar data.

Can they exsist? Sure, why not.

Do they exsist? Probably.

Have they been on earth? Probably not.

Are they on earth? Highly doubt it.

Would i like to meet a alien? Hell to the yes! :)

Lets also consider the fact that the earth atmosphere is also full of microscopic bacteria, viruses, fungi, and protozoa that can cause diseases. Surely without the immunity like us, those aliens would die instantly yeah?