Many scientists think it is possible that there is life elsewhere in the Universe, but that finding it may prove difficult.

First of all, we don't know exactly what form life on other planets outside our solar system might take, so it is difficult to know how to search for it. Second, the universe is a big place, and radio signals (and space vehicles) travel too slowly to allow us to find life that is very far away.

We do know something about the conditions on Mars, the planet in our solar system which is most likely to have life, and it turns out to be similar to the conditions in Antarctica (except for the lack of oxygen).

So we can guess what forms of life might be able to survive there, and there are projects under way that will someday send machines to Mars which can look for these kinds of life. There is more information about the exploration of Mars, for example in:

http://mars.jpl.nasa.gov/

Also, the SETI ("Search for ExtraTerrestrial Intelligence") institute has some pages which may be useful:

http://www.seti.org

We should be open to the idea of another life out there. It doesnt have to to be in human or similar forms, and its possible theres already another dimension in our universe.

Oh, there's definitely life on other planets. It's not feasible to say that there's not. What some people don't realize is that there are billions upon billions of galaxies, and we inhabit just one of those billions! There's also billions and billions of other planets. It's ridiculous (and also against the odds) that we are the sole planet with life in this universe filled with a trillion galaxies & planets.

Considering that the universe is infinite and that there are an infinite number of universes, is is a mathematical certainty that life does exist somewhere other than Earth

No...

But science will someday might experience it...maybe

Right now, All i can say is that scientist are saying... There might be a sign in life on Mars.

For all living creatures to survive, 3 mains parts are needed.
1. Organic molecules
2. water
3. energy

1. Organic molecules are living cells on earth. This cells contain an element known as Carbon. Elements are pure substances that contain only one type of atom. Carbon is a life forming element. CArbon can combine with any other elemts to make other things.

2. Water is the stuff that can allow little bits of carbon-based meterial. This cabon based material is called Organic Molecules. Orgranic molecules can move around, dissolve, and combine. In a human body, nearly 2/3 are water. In fact, Water is the unversisty solvent. Solvent is the thing that helps a substance dissolve. The solute is the substance that dissolves in the solvent...

Do you think aliens are real? The movie Independence Day showed us aliens that wanted to destroy us and our planet. Fortunately, these kinds of aliens are not real, but do make books and movies more exciting! However, real-life scientists are busy searching for life forms that may exist on other planets.

Last year, scientists made an exciting discovery when they found a meteorite from the planet Mars. Meteorites are rocks which fall to Earth from outer space. As these rocks pass through Earth's atmosphere, they often catch fire. At nighttime, you can often see meteorites falling to Earth as "shooting stars". This meteorite, named ALH 84001, is very special because it contains chemicals and structures that look like bacteria we have on Earth. Does this mean there's life on Mars? We don't really know the answer yet, but you can be sure there are many scientists searching for clues!

It all comes down to likelihood. We have no way of estimating the likelihood of the formation of life on a given planet. It could be 1 in a 100 or it could be 1 in a trillion trillion. If it's the former, then life does exist beyond Earth. If its the latter, then it almost definately does not. Until we narrow these odds down, all we can do is speculate blindly.

This is an off topic reply to Wellis:

Yes the universe is infinite. But is life? I mean, Theoretically, there are a finite number of life forms, on this planet or any planet. Granted, the number would be very high, but it would end somewhere. So to get the universal population per square light-year or whatever,we would divide "life" by "area". And we all know that any finite number devided by an infinite number is as close to nothing as can be.

So, mathmatically, we could say that no life exists, because the population of the universe is zero. Therefore, no one we know actually existed.

Again, this is off topic, but it's interesting.

i think that there is some way you can live on an other planet because, we addapted as humans to live on this planet so who is to say that, if there is life on other planets that, they have not adapted to the diversity of there planet even if it does not have water. becuase we only know the human race its is hard to tell what you need. what we should do is chack every planet within a certain distance and then if we find nothing then go a bit futher , we should look on the surface of the planet. we need to build a bigger telescop the biggest one is a 10 meter mirror in it just make a giant one then we can see if there is life on the surface.

To tell you the truth, i'm not sure. I wouldn't mind taking a trip to see for myself. For me I have to have rock solid proof to actually believe something like that. To me, it would be amazing for me to know/see what life is really like on other planets; in person. Mayebe one day I will be convinced that there is life on other planets. But its gonna have to take someone to really come with it for me to believe it. Hopefully someone can prove me wrong.

There are over 400 billion star systems in our galexy alone, so it is probabal, but unlikely, but it would be nieve to assume that we are the only organsim to evolve past anamilism, the aliens may also be visiting us, strange sightings, but we will have to wait & be patient to make contact, because they could already be planning an attack

may be the life on some planets had existed before the birth of earth. there are more than billions of planets in different types of galaxies and by the way, i don't think that the human specie can discover life on other planets as we all are not yet so advanced. this human specie needs a lot improvement and not just by the exploration of few nations its possible to get an answer of life on other planets. it might be ossible that the alien specie of the other planets are also curios about our existence. may be possible, but however its not the time to just ponder but the time to develop for the quest of other forms of life. however, it will take a few more decades or centuries and the courage to wander over the infinite space needs a strong heart and mind with experience.

There is life on other planets. I am 100% certain of it, and they are more advanced than us in a technical sense. I have both seen and felt it. A great number of other things as well I have seen! Imagine that!! I'm going to write a book on it before I die. I have already drawn pictures.......bridge..............I feel..........I still feel it actually. You all believe what you want.

I find it selfish and shallow-minded for someone to think thet we are on the only planet capable of sustaining life in the entirety of this universe.

I agree it's naive not to assume.Logic lies occassionally logic lies.

It is interesting to assume the big bang and big crunch to be instantaneously correlated simultaneously:and have no middle.If only God was an atheist i wonder ho ho ho santa clause.The clause is that the whole of eveything is a clam.

Yes that may be what we know can support life. how can we assume that those three things are the only thing that organisms need to live. we haven't discovered to know exactly what it takes for life to exist.

I think aliens have their existence in a world which is still unknown to us. we have a well idea about the Moon and little bit about the Mars only.Something is must going on every second we breathe.

Just curious, but a meteorite from Mars? How exactly did that chunk of rock gain the velocity to escape Mars' gravitational field and make its way to Earth on its own?

On the subject of SETI, I was at a thrift store and found a most interesting book called "The Search for Extra-Terrestrial Intelligence." It talks a lot about SETI, of course, and other programs working together to find intelligent life on other planets. Included are arguements about how we dont know what to look for, how advanced other civilizations might be (Which would help determine what we would be looking for), or if there is even a cap on technology which would determine if we ever find another advanced civilization. And if we DID find one, and there was NO cap on technology, then finding one that has existed for even 1000 years longer than us would be insanely more advanced than us. And as we know 1000 years in this universe is an instant. And looking for planets that can sustain life is not the only possible way to search for life. Imagine a technologically advanced civilization such as ours, on a planet like ours. The system they thrive in ultimately has to end at some point (Their star dies out, or apocalyptic event destroys their planet). Well its totally possible that they found a means to expand into space travel, and with that kind of technology, possibly colonize planets unable to sustain natural life and evolution. So while we are looking for planets in a permanently habitable zone, we're missing the real life forms flying around in their ships. Completely oblivious to each other. Life is easily possible elsewhere. The fact that we exist proves it. We might think its damn near infinitely impossible for us to exist, but thats in terms of how WE developed. How we evolved and adapted to life on planet Earth. That doesnt mean it is the only way for Life to survive.

What if we are just an accident? A unique accident?

Ok to be honest i know there is something out there i can just feel it some scientists say there is nothing but also say space goes on forever but then they are hypocritical coz iff space goes on forever then how can they say no life exists and we all on earth or the majority say crop circles are a fake how do we know thre keys man mapping out secluded places like a farm nice and quiet to land sightings i mean yeah some must be faked but i know most are real...how do u know when u dream u havent been abducted and u cant say its no possible coz your not awake u would never know...when they do come there coming for a purpose #1 there coming to invade coz they haved used all resources on there planet or #2 there just friendly visitors as some might say...but me i think they dont come to play nice so lets wait an see thats even iff i see in my lifetime.

Of course, there has to be. think about it. no one knows where the end of the universe is or if there is one. or even whats past the universe. I'm sure other beings on different planets know we are here. they probably advanced far before we did and have the technology to know. we as a human race have progressed a long way from 90,000 years ago. you think, maybe they would be reasonable and think "hey, we used to be in the same situation as they were, lets leave them be and gain the technology on their own." I just want to know where we will be in another thousand years. just think of how far we've come in the past 50 years, forget about 90,000 we are already planning on a manned mission to mars. thats just my opinion, i think that you are ignorant to think there is no life on other planets.

''some scientists say there is nothing but also say space goes on forever but then they are hypocritical coz iff space goes on forever then how can they say no life exists''
Those scientists probably aren't saying that there is no life in the universe but that UFOs, flying saucers and crop circles are all fake. It's all just one massive hoax. Here's some reasons why for example crop circles are fake:
1: carrying messages through visual symbols is complicated. If I wanted to send a warning or something then I'd just use radio signals. Humankind has been sending radio signals into the universe for decades so they'll know we can receive them.
2: If I were an alien and I would try to put a message into a crop field, I'd just use a laser. But as far as I know no crop circles have ever shown fire damage. It's just flattened wheat that makes up the symbols. Not a very efficient way IMO.
3: It's just fake. Several people have admitted to making them, It's even been filmed a few times. The people who do this are professionals and they know how to make them believable.

About abductions. Well I think there've been so many abductions by now that the ET's have collected enough data right? It's just some pathetic peoples who have a strange dream or sleepparalysis and then they claim to have been abducted by aliens. In the middle ages it were angels or devils, in the 18th century it were ghosts, and now it's aliens.

''when they do come there coming for a purpose #1 there coming to invade coz they haved used all resources on there planet or #2 there just friendly visitors as some might say..''
If they are here to attack us then why haven't they done already? Since we haven't discovered their ships nor their homeworld(s) yet I do think they have enough technology to wipe us of the face of the earth in a blink of an eye. And if they're looking for resources, well I'd say they would have come really far for a bit of metal and stuff... Because we haven't found their homeplanet yet I think it's pretty far away. Making it a long and useless journey.

I hope you now change your mind, because it's all just one big scam to make you believe it's all true. And if you now believe this is all some sort of complot (yea there are people who believe that out there) then you're just f-ing paranoid.

My take on this is a resounding ...Definitely Yes!! Why would I say this, the truth as carefully as it has been contrived and made up is they do exist. They always have. Is it so hard to believe in a much more technologically advanced civilization?? Not really. There are those that know, and those that have always known. Look at some of the art from the renasaince days, (the last time people of this planet were enlightened) saucer shaped objects depicted in many of the art. Why include that in art if isn't significant? Ancient structures more complex, utilizing complex mathematics than we can't explain by today's standards? Mathematics that require specific knowledge of the earths exact circumference( that we now know because of satelite technology) Are you kidding me? How bout all of the information that is no longer available from the library of Alexandria which was located in modern day Iraq. Alexandria was a library that housed many old texts and ancient arttifacts predating christianity. Why is it multiple cultures have a similar cataclysmic disaster story, and flood. The vedics of India depict artwork of saucers, and text specifcally mentioning flying craft!! Sumerians the first modern civilization (Babylon) (money, philosophy, school,legal,writing...ect) that just sprang up. They were said to wroship multiple gods, but they were to never to show them as they appear.....hmmm sounds strange if you ask me. They write of a creation story similar to the bible, however mention that "their creators" were from "heaven"(sky) and were of reptilian nature, and taught them the sciences and mathematics of their civilization. Hmm so you have a once primitive people (hunter/gatherer society) that is visited by (sky beings) whom they can only say, not having previous knowledge of such beings, must be gods because they are so much more advanced, with advanced knowledge ect. Now what would you think if you were a primitive hunter that lived off the land? Would they not be gods to you? Would you not call technology magic? I didn;t even mention the stories of subterranean tunnels and reports of eyewitness of strange beings. or the occult link to it all, or the secret societies that abound. It seems it it is all related to the truth. It all leads bck to Mesopotamia and the "gods". (now modern day Iraq)

No one knows, apparently one of saturns moons may have water. it takes seven years to go, so wait until in seven years.

Well that is not entirely true. If the universe is infinite than so is are the inhabitable planets, moons, asteroids and so on. So it would still be infinite divided by infinite.

''So to get the universal population per square light-year or whatever,we would divide "life" by "area". And we all know that any finite number devided by an infinite number is as close to nothing as can be. So, mathmatically, we could say that no life exists, because the population of the universe is zero. ''

if we assume the universe is nearly infinite and the number of inhabitable bodies is really high than you would indeed get a very low number, meaning the population per square light year is very low, but that doesn't mean life doesn't exist. It just means that the universe is really empty (very little inhabitable bodies). But that's not really something very strange, I mean we knew that already. Most of the universe is just empty space, clouds of gas, superhot stars and supermassive black holes. Things near which no life can exist. inhabitable planets are quite rare in the sense that they can't exist in a very big part of the universe.
Meaning the population per square lightyear is indeed very low. But not non-existent.

If an inteligent life form exists now in a distant galaxy somwhere and had their planet developed lets say even 300 years before ours, I think they would have evolved far enough to know of our existence, and had they discovered us would it be right to assume that they would leave us alone to evolve at our own pace?, would we have done that if the tables were turned?... taking into account our current curiosity?
Maybey there is no life out there, but maybey a parallel universe existing with its sole and only earth? concidering the theory of quantum decoherence and other formulae that suports this?

A thought...

Have you ever thought that the perception of life and all matter, everything thats vissual could be an illusion? that life after death caries on on other planets in a series of stages but in a spritual dwelling until it reaches the last "stage" the Sun...
which is the source of all energy? and concidering that religion is a manual before leaving earth?

just a thought...

Well that would be true if you assumed that the laws of Physics and Biology that we use have flaws... it is better not to dwell on the extremely uncertain.

The answer is 100% yes.
have they been to earth ? 100% yes. they are here now.
they have always been here.
the government knows this full well.
all you have to do is look at lunar images there is no reason to scrub image but nasa does .
why haven't we set up bases on the moon?
if we could we would have long ago.... sticking a bunch of people in orbit is stupid when you can park them on the moon.
but we do it..

I beleive deadfire that either it was ejected by volcano long ago or another meteorite blasted it out.

Or it may not be carbon based

THIS IS JUST PLAIN DUMB!!!!

"The answer is 100% yes. have they been to earth ? 100% yes. they are here now. they have always been here. the government knows this full well. all you have to do is look at lunar images there is no reason to scrub image but nasa does . why haven't we set up bases on the moon? if we could we would have long ago.... sticking a bunch of people in orbit is stupid when you can park them on the moon. but we do it.. "

number1 obamas to busy wasting money to fund a moon base and 2 thiers no popular demand like thier was at the time.

But is the Universe actually infinite? If space is that which separates objects or energy and has a capacity for being bent, then if we accept the Big Bang happened 12.5 billion years ago then the edge of the universe or horizon is 12.5 billion from the centre and expanding but that does not mean it as at present infinite. Its just my own idea but I suggest that this may cause a negative pressure in that there is actually nothing there, not even time nor space which would cause expansion to accelerate(which it does)known as dark energy.
Until recently it was thought that planetary formation was a rare event, but now we are finding that it is not and may be the norm. Many of those planetary systems are not going to be hospitable to advanced forms of lifebut even if its only one in a million then that's a thousdand in a (US) billion.

Yes i think so because On the other planet, life started in the same way as the evolution theory says that it started here. Apart from the fact that the evolution theory is not the well-rounded and totally scientifically proven theory that people want us to believe, in general, followers of the theory tell that the chance of life starting on a planet is rather small. A term used is sometimes: A magnificent accident. I believe the probability is even smaller than they say, too small to assume that it actually can have happened by accident, but even if you believe life on earth was such a magnificent accident, the chances that this has happened more than once are too small to assume that that can have happened.

Yes, there is definitely extraterrestrial life. The Universe is massive with a large amount of galaxies. Each one has billions of trillions of stars that most likely have planets orbiting them older than the earth. Now if life has evolved on earth, it's most likely evolved on other planets as well.

We're not an accident we are here for a reason

Yes there is actually an extraterrestrial life because in other planets like mars were there is oxigen that is because there is plants in it and in others where water exist, in that water there should be some aquatic livings in it. So some of these proves that thire is an extraterestrial life

I agree, 100% also and area 52 was called, area 51

Why does the government have to hide area 51 or 52
why can.t the government reveal what there is in that place

Where did you get infinity from in your sum? You say you are dividing life by the area of a square light year. A light year isn't infinite! Whatever tiny product you would get by doing this sum you could then muliply by the size of the universe... which could be an infinite amount of life!Depending on whether you think the universe is infinite.

There is disused rifle range on the Isle of Wight at Newtown and the Ministry f Defence still won't let people go there. Something about unexploded ammunition THEY say! But I know it has been taken over by Daleks!!!

To think that their are alliens that have been to our planet is stupid. if you think that the government could keep this from us.... your wrong the government couldnt keep the theory of global warming from the public i dont think they could keep alliens from us either. i also find it that you think that aliens might want to attack us, from what you are saying that they have been here for some time now whats stoping them and whats stoped them in the past. i belive that area 51 is not trying to hide alliens they are testing and making new weapons for war. the reason it is so seacret is if other countrys find out about them they could have the uper hand..... think bout it

Why should I not respond when I know the truth....just as many others do......there is life other than ours in the universe.....why should I be so quiet with this knowledge.....here's an idea.....I will tell one of my professors tomorrow what it is I believe and see how much he/she laughs.....or pretends not to know.....

The escape velocity of Mars is 5.027 km/sec. Mars has an orbital speed of about 24 km/sec., so a meteor hitting Mars would travel at least as fast at impact. So, with meteors hitting Mars at 5x its escape velocity, yes, there is a good probability that a few rocks would be blasted free. Also, Mars is in a rather dangerous neighborhood, and it gets hit pretty often, even to this day.
A tiny percentage of these rocks, pulled to the inner solar system by the sun, would would almost almost certainty his the Earth.

Could be........ i dont think so tho, i say life after death is false. people made this up to help them go to bed at night. but what if other people in our universe also think bout ( if their is other people)(or things)the same thing. no one will know, until the time comes.

Well, I do agree with your thinking upto some extent. But, you think that the evidences they showed us and what media had revealed can't be just like air.Afterall the most amount of money is used in science and technology sector to reveal some more discoveries related to aliens and rest of the planets.

I know what you mean...... but what i belive in and what every other human belives is probly diff. basicly were all the bitches in this relationships with the government. we might ask but they wont tell it could be aliens! or weapons or even nothin (probly not tho). i think its weapons so do a mill other people do, also a mill people think its aliens, and a millon people couldnt give a shit to what the government is hiding from the public.and the rest go under "others" if you know what i mean. we all have our own thoughts and that wont change to easly. since the gov is hiding whatever is in their i think it just makes us wonder whats in their even more. enought that we start thinking and mybe making up stuff that the government might want to hide from the public......i aint saying i dont belive in aliens it just means i dont think we have discovered them or they discovered us yet.