Is there life in the universe, and if so has it visited Earth?

[Ivan Seeking]

Comet probes reveal evidence of origin of life, scientists claim

...The Cardiff team suggests that radioactive elements can keep water in liquid form in comet interiors for millions of years, making them potentially ideal “incubators” for early life. They also point out that the billions of comets in our solar system and across the galaxy contain far more clay than the early Earth did. The researchers calculate the odds of life starting on Earth rather than inside a comet at one trillion trillion (10 to the power of 24) to one against. [continued]

http://www.physorg.com/news106316780.html

 

[Ivan Seeking]

The theory that comets seeded life on Earth gained support Thursday, with a team of scientists experimentally proving that the raw materials for life hitchiking aboard a space rock could survive the trip to our planet.

...In Blank's experiments, not only did a good fraction of the amino acids survive the simulated comet collision, but many evolved into chains of two, three and four amino acids, so-called peptides. Peptides with longer chains are called polypeptides, while even longer ones are called proteins.

"We saw variations in the ratios of peptides produced depending on the conditions of temperature, pressure and duration of the impact. This is the beginning of a new field of science," Blank said.[continued]

http://www.space.com/scienceastronomy/solarsystem/comet_life_010405.html

 

[muralic]

our tecnology should be more developed,in order to find et's. what if they are thousand years ahead of us.what if they are more intelligent then we are.they would have well developed tecnologies than what we have now.there are no places for speculations here.lets wait and see what happens

 

[DaveC426913]

there are no places for speculations here.

Seems to me this is the quintessential topic for speculation.

 

[Capuchin]

do you think the intelligent life has visited Earth?

Yes. It evolved here. (what?)

 

[Xori]

Here's my issue:

A super intelligent technologically advanced civilization constructs super advanced spaceships and traverses hundreds of millions of light years across stars and galaxies, finding their exact path to Earth through countless asteroids, dust, radiation, stars, black holes, etc, etc... Then, they crash in Roswell. Make sense to you?

 

[treborly45]

Here's my issue:

A super intelligent technologically advanced civilization constructs super advanced spaceships and traverses hundreds of millions of light years across stars and galaxies, finding their exact path to Earth through countless asteroids, dust, radiation, stars, black holes, etc, etc... Then, they crash in Roswell. Make sense to you?

well, for one. Isnt there a star like 6.5 light years away? And maybe their just sending unmanned drones to test for life, Just like we do on mars. Also, You don't know how long they have been here for( if at all), so can't really judge their crash record.

 

[DaveC426913]

Here's my issue:

A super intelligent technologically advanced civilization constructs super advanced spaceships and traverses hundreds of millions of light years across stars and galaxies, finding their exact path to Earth through countless asteroids, dust, radiation, stars, black holes, etc, etc... Then, they crash in Roswell. Make sense to you?

That's hugely suppositional. You suppose you know where they came from, how far they travelled, how they got here, why they came... the list is virtually endless.

But even granting all those suppositions, by that logic, no Spanish galleon who have ever foundered on the shores of the Western world.

 

[Ivan Seeking]

The Allen Telescope Array is online

The switch has been thrown on a telescope specifically designed to seek out alien life.

Funded by Microsoft co-founder Paul Allen, the finished array will have 350 six-metre antennas and will be one of the world's largest.

...On 11 October, the first 42 dishes of the array started gathering data that will be analysed for signs of alien life and help with conventional radio astronomy. [continued]

http://news.bbc.co.uk/2/hi/technology/7041183.stm

 

[Ivan Seeking]

...Astronomers reported Tuesday that there were at least five planets circling a star there known as 55 Cancri, where only four had been known before, making it the most extensive planetary system yet found outside our own. It is also the one that most resembles our solar system, with a giant planet orbiting far out from the star and four smaller ones circling closer in.

...Another team member, Geoff Marcy, a professor at the University of California, Berkeley, said the discovery had him “jumping out of my socks.” He said, “We now know our Sun and its family of planets is not unusual.” [continued]

http://www.nytimes.com/2007/11/06/s...em&ex=1194670800&en=9671413ac0ec230b&ei=5087

 

[zoobyshoe]

http://www.nytimes.com/2007/11/06/s...em&ex=1194670800&en=9671413ac0ec230b&ei=5087

The star’s three innermost planets all circle more tightly than Mercury at distances from 22 million to 3.5 million miles. The closest of three is also the smallest, only 18 as massive as Earth and surely permanently scorched.

The new planet, which Dr. Fischer called “one of the more annoying planets” because it resisted being folded into their mathematical models for such a long time, basks in the lukewarm light of its star from a distance of around 70 million miles, taking 260 days to complete one orbit. Although too massive for life itself, Dr. Marcy said, the planet could harbor rocky moons, just as Saturn and Neptune in our own solar system do, and these would be warmed to the same lukewarm temperatures as Earth.

How do they determine when a planet is too massive "for life itself"?

 

[Ivan Seeking]

Are Aliens Among Us?

... No planet is more Earth-like than Earth itself, so if life does emerge readily under terrestrial conditions, then perhaps it formed many times on our home planet. To pursue this tantalizing possibility, scientists have begun searching deserts, lakes and caverns for evidence of “alien” life-forms—organisms that would differ fundamentally from all known living creatures because they arose independently. Most likely, such organisms would be microscopic, so researchers are devising tests to identify exotic microbes that could be living among us.[continued]

http://www.sciam.com/article.cfm?id=are-aliens-among-us&print=true

 

[notagenius]

you assume that aliens have to physically visit earth. a "species" that advanced wouldn't have to visit us in material form. that much i guarantee.

 

[Evo]

you assume that aliens have to physically visit earth. a "species" that advanced wouldn't have to visit us in material form. that much i guarantee.

Do you think that any planet can sustain a single life form long enough for them to advance that far? The Earth hasn't been able to.

 

[Sorry!]

Do you think that any planet can sustain a single life form long enough for them to advance that far? The Earth hasn't been able to.

well dude if they could come to Earth then who's to say that a single planet sustained them?

 

[Evo]

well dude if they could come to Earth then who's to say that a single planet sustained them?

Good point.

 

[Ivan Seeking]

Sorry, Sorry, but Evo's not a dude. She's a dudess.

 

[Eezekiel]

Its tuff to say without really knowing how life on Earth first began. If we find life on Earth began simply as standard recipe that arises from a common set of conditions that are found throughout the universe, then it seems life would be found on any planet similar to earth. However, Earth life could be a one time thing that can not be replicated. Its all about finding how life was first created to see the likely hood of life being a universal thing. That is of course, unless aliens just show up at our doorstep or if we happen to ease drop on them using SETI :)

 

[notagenius]

well dude if they could come to Earth then who's to say that a single planet sustained them?

exactly. as humans we see everything in terms of our world, observations from our solar system, etc. i think this stuff is largely beyond 21st century science.

 

[DaveC426913]

Interesting conflagration of posting:

"Sorry, Sorry, but Evo's not a dude. She's a dudess. "

"Its tuff to say without really knowing how life on Earth first began."


Eezekiel, you're taking your life in your hands...

 

[Zantra]

we're going on a couple of assumptions, such as:

1. Life intelligent enough to travel to Earth will naturally approach us cautiously and monitor us for years to determine the situation.

2.They wouldn't just assess our inferiority and wipe us out if they perceived us as a threat.

3. Alien beings actually want to learn about us. That assumes they think like us, which we can't assume. The term alien doesn't just apply visually, but to overall existence. Trying to recreate the thought processes of a being whose existence you don't know, and possibly couldn't comprehend is like trying to imagine how a square thinks, if a square could think.

4. I think if life did exist, and it did come to us, the odds of us understanding (at least initially) their thought process, goals, motivations, or anything else, is about as likely as them speaking english.

Personally I think that if life DID exist, and somehow contacted us, it would be something beyond comprehension, possibly beyond understanding, because we know only what is on this earth. And 500 years ago we KNEW the Earth was flat. We know nothing. In the vast depths of all possible knowledge in the universe, we know the equivalent of 6 months on the know universal timeline. So close enough to nada;)

 

[DaveC426913]

And 500 years ago we KNEW the Earth was flat. We know nothing.

Not true. 500 years ago we did not have the Scientific Method. Things we "know" today are quantifiably, qualitatively and objectively more valid than things we "knew" prior to the SM. It's like night and day.

 

[Zantra]

Not true. 500 years ago we did not have the Scientific Method. Things we "know" today are quantifiably, qualitatively and objectively more valid than things we "knew" prior to the SM. It's like night and day.

The time frame is simply an example to demonstrate that our knowledge continues to expand every day, and that this is the beginning of knowledge. In other words, we can't make assumptions

 

[Sorry!]

we're going on a couple of assumptions, such as:

1. Life intelligent enough to travel to Earth will naturally approach us cautiously and monitor us for years to determine the situation.

2.They wouldn't just assess our inferiority and wipe us out if they perceived us as a threat.

3. Alien beings actually want to learn about us. That assumes they think like us, which we can't assume. The term alien doesn't just apply visually, but to overall existence. Trying to recreate the thought processes of a being whose existence you don't know, and possibly couldn't comprehend is like trying to imagine how a square thinks, if a square could think.

4. I think if life did exist, and it did come to us, the odds of us understanding (at least initially) their thought process, goals, motivations, or anything else, is about as likely as them speaking english.

Personally I think that if life DID exist, and somehow contacted us, it would be something beyond comprehension, possibly beyond understanding, because we know only what is on this earth. And 500 years ago we KNEW the Earth was flat. We know nothing. In the vast depths of all possible knowledge in the universe, we know the equivalent of 6 months on the know universal timeline. So close enough to nada;)

that's why we try to simplify things as much as possible when we consider interaction with other life forms... if they are 'intelligent' then we would assume that they would have a basic understanding of what we convey... if it they think it's wrong or beyond comprehension they should come to an understanding. hm?

and the reason we have those 4 assumptions runs on the same logic... we consider ourselves to be intelligent and it's what WE WOULD do if we could travel to study other life
And my bad Evo :D i just say dude to anyone :p

 

[Zantra]

that's why we try to simplify things as much as possible when we consider interaction with other life forms... if they are 'intelligent' then we would assume that they would have a basic understanding of what we convey... if it they think it's wrong or beyond comprehension they should come to an understanding. hm?

and the reason we have those 4 assumptions runs on the same logic... we consider ourselves to be intelligent and it's what WE WOULD do if we could travel to study other life
And my bad Evo :D i just say dude to anyone :p

Then I guess we should hope they approach things,have the same logic and value systems, and understand things eactly as we do

 

[Pierce258]

This topic is always one of controversy. Regardless of how anyone believes life was created, I think it would be safe to assume there may very well be life outside of earth. With as many stars, planets, galaxies, etc. as there could be out there, it could be foolish to assume we inhabit the only one with life. It is exciting to think there could be others out there with a new kind of knowledge. Until solved, it will be the most inspiring question man has to answer. There will always be someone who can give us another piece to the puzzle.

 

[nicky nichols]

I voted YES.

I considered the research on

1) primitive life forms operating on similar or differing biochemical principles (Davies NASA)

2) alternative and fringe scientific arguments such as "animals from one planet became plants on another" (many science fiction stories t.b.x., apparently this idea also occurs in ancient Indian astronomy t.b.x.)

3) classical philosophical dissertations such as "theory of life eternal" (my received information from disscusion elsewhere - eternal refers to "Saturn beyond all existence", the Roman astronomers already considered that life originated on Jupiter, then it got to Mars, and finally to Earth! And so they believed! - t.b.x. although I'm not really up to searching through vast swathes of classical literature, I shall try...)

Of course, I am talking about primitive life, not advanced!

On advanced life, I tend to side with the reasonable mainstream scientists.

Perhaps we are the alien life itself, and would not exist in our present day form, were it not for the arrival of our primitive past form predecessors.

 

[Ivan Seeking]

it is also possible that animal life on one planet becomes plant life on another.

Could you explain what you mean?

 

[Pippo]

http://video.google.com/videoplay?docid=-5594744703753734741

Bearing in mind this post by Ivan in the UFO stickied thread.

10,000,000,000,000,000,000,000 stars in the universe, a very conservative estimate but let's assume it's correct.

And the Drake equation is possible given the criteria and confirms there must be intelligent life: maybe in the galaxy, but definitely in the universe by the laws of probability.

http://www.activemind.com/Mysterious/Topics/SETI/drake_equation.html

And apply this to the universe, in a sort of what if way assuming this is fairly typical.

My question is two fold, we're fairly certain that probability indicates there must be life elsewhere in the universe, and assuming evolution works in simiilar if not the same ways elsewhere: it's fair to claim that their is intelligent life, so we accept life is out there? Yes/no?

Now given the conclusion is yes, do you think the intelligent life has visited Earth?

I would think in a very simple way : life on Earth demonstrates that there is life in the universe but can't demonstrate that it is the only one. About visiting the Earth by others it is not interesting over than for a pure curiosity.

 

[nicky nichols]

quick theory of transevolution, an example in this instance would be that an animal which had evolved on a low gravity world wouldn't be able to move about properly upon its' arrival on a high gravity world, thus it stays still, turns itself upside down and buries its' head in the ground whereupon its' body becomes a plant...told you it was science fiction, however I suspect that there might well be the condensation of a yet to be elucidated bioevolutionary principle...