Do you believe in aliens?

[cryptosza]

Yes, I do. Maybe not the type of aliens we see in popular culture, but organisms that exist outside of our planet.

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[Guy Montag]

Considering the size of the Universe, chances of only one planet being capable of supporting life and this life evolving into a sapient species seem astronomically low.
However, considering the size of the Universe, the chances of two such species meeting eah other seem even lower.

[Farasha]

Wow, this is a very well received topic, a lot of responses.

[JungleBadman]

Start with the number of stars in our galaxy, which is conservatively estimated at 100 billion, though is often cited as three times that. Of those 100 billion, from 20% to 50% probably harbor planetary systems—an estimate that becomes more and more reliable as the Kepler Space Telescope and various ground-based observatories detect increasing numbers of exoplanets.

Not all of those exoplanets would be capable of sustaining Earth-like life, so the equation assumes from 1 to 5 in any system could. Of those bio-friendly worlds, from 0% to 100% would actually go on to develop life. And of those world, in turn, from 0% to 100% would develop life forms that we would consider intelligent.

The mere existence of intelligent life forms tells us nothing, however, unless they have the ability to make themselves known—which means to manipulate radio waves and other forms of electromagnetic signaling. It's estimated that from 10% to 20% of the smart civilizations would clear that bar.

Finally, and perhaps most anthropocentrically, consider how long any one of those civilizations would be around to blink their signals our way. A sun like ours survives for about 10 billion years; life on Earth has been around for only about 3.5 billion years, and humans have been radio-capable for barely a century.

If we destroy ourselves in an environmental or nuclear holocaust tomorrow, our signal will go dark then. If we survive for tens of thousands of years, we will be announcing our presence to the cosmos for far longer—and the same is true of all of the other civilizations that live in the Milky Way.

If you play the game conservatively—lowballing all of the variables—you might get about 1,000 detectable civilizations out there at any given time. Play it more liberally and you get hundreds of millions. Imagine there are 10,000 detectable civilizations and we are likely to find alien life by 2040. If there are a million, we’d discover alien life by 2028.

Its far more statistically likely that aliens exist somewhere than that we are the only planet with life in the universe.

[v3teran]

If we were the only living things in the universe on planet earth then the rest of the universe would be an awful waste of space wouldnt it. Common sense says that life exists other than our own.

[Edfeilbartolome]

because alien is not true i believe To See Is believe because alien is not fucking true?!!? Your crazy if you are believe in aliens what the hell are you? even if you have a proof

[JungleBadman]

because alien is not true i believe To See Is believe because alien is not fucking true?!!? Your crazy if you are believe in aliens what the hell are you? even if you have a proof

How can there not be aliens? Do you realise how many other planets there are?

[Flying_Soul]

We are the aliens lol. Just look of what we are doing to our "native" planet

[Ilyli]

Yes, because I feel that it is highly unlikely that we are the only intelligent life in a universe with billions of stars, planets, and solar systems. With that many places for life to arise, statistical improbabilities become pretty high in terms of likelihood.

[WorldBiz project]

I like science and science fiction as well, but I cannot believe in UFOs and green men

[S.Samarakoon]

Yes I do

[fernanjames]

no!i dont believe alien

[PyraCrypto]

Not sure is believing in aliens is relevant in today's world.

[Hasini.Nathasha]

No I dont believe it

[DonaldHun]

I believe in the life of a second world. a lot of the phenomenon was confirmed by scientists and are tracking farther

[roronoa zoro]

Kehidupan suatu planet di luar bumi pasti ada makhluk hidupnya.Jadi kita harus percaya tentang adanya suatu kehidupan terhadap planet lain di luar planet bumi yaitu bisa dikatakan alien.Alien sendiri juga makhluk hidup yang dapat tumbuh dan berkembang.

[Stromspirit]

Do you believe in aliens? no, because I have never seen with my own eyes.

[Nishantha.98]

Yes I will 

[kulet]

I believe that the elite is there because it ever came down to the earth that in declining down in the country of Italy

[RyabovRavel86]

I believe in aliens, but I have never seen them