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Drake Vs Fermi...

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If the universe is teeming with ... - Stephen Webb - Google Livres. Ntact with alien civilizations ... - Michael A. G. Michaud - Google Livres. Paul Hughes: Exotic Civilizations: A Possible Answer To Fermi's Paradox. By Most science fiction and scientific speculation regarding our future advancement and that of advanced extraterrestrial civilizations, follows a path of increasingly visible expansion out into the galaxy.

It starts first with colonization of the planets of their home star system, followed by interstellar travel, interstellar colonies, interstellar federations or empires, then out further to more and more of the galaxy, until you have a galactic wide civilization. Since we haven’t seen any of evidence of these advanced civilizations, the argument goes that that such a strong lack of evidence can only mean one thing - there are no advanced extraterrestrial civilizations. As I will argue, this is an incredibly premature conclusion. A scheme for classifying such advanced technological civilizations was proposed by Nikolai Kardashev in 1964.

. : Controls the energy of an entire planet. . : Controls the energy of an entire star. . : Controls the energy of an entire galaxy. {*style:<b> </i>*} What Are The Odds? The Milky Way Contains at Least 100 Billion Planets According to Survey (01/11/2012) - The Full Story. The full news release story: View this image Our Milky Way galaxy contains a minimum of 100 billion planets according to a detailed statistical study based on the detection of three extrasolar planets by an observational technique called microlensing. Kailash Sahu, of the Space Telescope Science Institute in Baltimore, Md., is part of an international team reporting today that our galaxy contains a minimum of one planet for every star on average. This means that there is likely to be a minimum of 1,500 planets within just 50 light-years of Earth. The results are based on observations taken over six years by the PLANET (Probing Lensing Anomalies NETwork) collaboration, which Sahu co-founded in 1995.

The study concludes that there are far more Earth-sized planets than bloated Jupiter-sized worlds. This is based on calibrating a planetary mass function that shows the number of planets increases for lower mass worlds. Advanced alien civilizations, have we already found some? « Astrobioloblog. Lots of scientists think our Galaxy should be full of advanced alien civilizations (see the Drake Equation and Fermi Paradox posts). But when they’ve looked the Galaxy appears to be quiet and lonely. Where are all the alien civilizations they ask? Many insane people would of course argue with this, pointing out that aliens have visited us; that they created the pyramids, Atlantis and humankind itself.

That they regularly abduct and probe drunk Americans, that the government knows and is covering it up, and that the government itself may even by aliens, alien communists, sent here to steal freedom from God-loving Americans. But then they’re insane. In a previous post I argued that alien life might be common, but that simple life rarely evolves into intelligent life, and that even if it does, intelligent life may not exist for very long. Type 1 civilizations – use all of the energy that their planet receives from their star. So I promised you proof of vast alien structures in space. Robots, Goblins and Alien Amoeba, Answering Fermi’s Paradox. By REV. MAX I believe there are many gods, not one, and always in conflict. Well, if there are gods who created and control what’s going on here, you can tell a lot about them by what is going on.

I assume they are colonists. And so anything you can see here you can infer is the act or the will of one of those gods. Dateline: 1950 A.D. “Don’t you ever wonder where everybody is?” In other words, if the galaxy is filled with little green men in luminous flying saucers who travel from star to star colonising other worlds, then why don’t we have any physical evidence of their existence – not even so much as a piece of broken zipper from one of their spacesuits? This question (known as the Fermi paradox) has spawned a vigorous scientific and philosophical debate whose possible answers can be grouped into three broad categories.

Are We Alone? Of course, even if most alien species do expire in this way, isn’t it stretching the limits of conjecture to suppose that all of them do? Or Conclusion 1. 2. No Aliens in 14 Wild Ideas. Why Can't We See Evidence Of Alien Life? Universe - The Drake equation (pictures, video, facts & news) The Billion-Year Technology Gap: Could One Exist? (The Weekend Feature) The odds of there being only one single planet that evolved life among all that unfathomable vastness seems so incredible that it is all but completely irrational to believe. But then "where are they? " asked physicist Enrico Fermi while having lunch with his colleagues in 1950. Fermi reasoned, if there are other advanced extraterrestrial civilizations, then why is there no evidence of such, like spacecraft or probes floating around the Milky Way.

His question became famously known as the Fermi Paradox. The paradox is the contradiction between the high estimates of the probability of the existence of extraterrestrial civilizations and yet the lack of evidence for, or contact with, any such civilizations. Given the extreme age of the universe, and its vast number of stars, if planets like Earth are at all typical, then there should be many advanced extraterrestrial civilizations out there, and at least a few in our own Milky Way. For proposition “B” to be correct would defy all logic.

The Fermi Paradox. Fermi's Paradox Revisited by Dr. Jeff Kuhn. Fermi paradox. A graphical representation of the Arecibo message – Humanity's first attempt to use radio waves to actively communicate its existence to alien civilizations The Fermi paradox (or Fermi's paradox) is the apparent contradiction between high estimates of the probability of the existence of extraterrestrial civilization and humanity's lack of contact with, or evidence for, such civilizations.[1] The basic points of the argument, made by physicists Enrico Fermi and Michael H. Hart, are: The Sun is a young star. There are billions of stars in the galaxy that are billions of years older;some of these stars probably have Earth-like planets[2] which, if the Earth is typical, may develop intelligent life;presumably, some of these civilizations will develop interstellar travel, a technology Earth is investigating even now, such as that used in the proposed 100 Year Starship;at any practical pace of interstellar travel, the galaxy can be completely colonized in a few tens of millions of years.

Andart: Finding Fermi. Finding Fermi Inviting invasion: deep space advertisments and planetary security (Practical Ethics) - I blog about the ethics of sending adverts into space. Basically, I don't think they make things better or worse. I did not have the space in the article to list my full list of the Fermi paradox "solutions", but here they are: Aliens exist, but we see no evidence Human limitations Human beings have not been searching long enough (Freitas Jr 1983; Freitas Jr. 1985) Human beings are not listening properly Practical limitations Communication is impossible due to problems of scale Intelligent civilizations are too far apart in space or time (Wesson 1990) Communication is impossible for technical reasons They only recently emerged and have not yet had the time to become visible.

This could for example be due to synchronization due to a declining rate of gamma ray bursts that sterilize much of the galaxy (Annis 1999; Cirkovic 2004). Calculer le nombre de civilisations extra-terrestres. La nouvelle équation qui tente de connaitre nos chances de trouver la vie ailleurs dans l’Univers. En 1961, l’astronome américain Frank Drake conçut une équation qui pourrait, théoriquement, prédire la probabilité de trouver une vie intelligente sur certaines planètes lointaines. Bien que cette équation ne peut effectivement résoudre pour "x"*, elle a aidé à faire la lumière sur le nombre exact des différents facteurs qui sont réellement impliqués dans la recherche de vie intelligente. *Dans cette équation, il y a tellement d’inconnues qui ne peuvent être quantifiés que les amateurs et scientifiques y ont appliqué une variété de valeurs au cours des 50 dernières années, chacune d’elles purement spéculatives.

Les valeurs de N (ces civilisations avec qui nous serions en mesure de communiquer), ont varié de une jusqu’aux millions. Ci-dessous une représentation de son dernier travail visant a redéfinir la zone d’habitabilité, la bonne distance d’une planète par rapport à son étoile pour soutenir la vie (Towards the Minimum Inner Edge Distance of the Habitable Zone) L’équation de Seager. The Fermi Paradox - Wait But Why. PDF: We made a fancy PDF of this post for printing and offline viewing.

Buy it here. (Or see a preview.) Everyone feels something when they’re in a really good starry place on a really good starry night and they look up and see this: Some people stick with the traditional, feeling struck by the epic beauty or blown away by the insane scale of the universe. Physicist Enrico Fermi felt something too—”Where is everybody?” A really starry sky seems vast—but all we’re looking at is our very local neighborhood. Galaxy image: Nick Risinger When confronted with the topic of stars and galaxies, a question that tantalizes most humans is, “Is there other intelligent life out there?” As many stars as there are in our galaxy (100 – 400 billion), there are roughly an equal number of galaxies in the observable universe—so for every star in the colossal Milky Way, there’s a whole galaxy out there.

So there are 100 Earth-like planets for every grain of sand in the world. But it hasn’t. Where is everybody? Au moins 17 milliards de planètes de taille terrestre dans la Voie lactée. Size Of The Universe. Is our universe inside a bubble? First observational test of the 'multiverse' The theory that our universe is contained inside a bubble, and that multiple alternative universes exist inside their own bubbles -- making up the 'multiverse' -- is, for the first time, being tested by physicists. Two research papers published in Physical Review Letters and Physical Review D are the first to detail how to search for signatures of other universes. Physicists are now searching for disk-like patterns in the cosmic microwave background (CMB) radiation -- relic heat radiation left over from the Big Bang -- which could provide tell-tale evidence of collisions between other universes and our own. Many modern theories of fundamental physics predict that our universe is contained inside a bubble.

In addition to our bubble, this `multiverse' will contain others, each of which can be thought of as containing a universe. One of many dilemmas facing physicists is that humans are very good at cherry-picking patterns in the data that may just be coincidence. Mib final. Journey to the Edge of the Universe. Future - Science & Environment - Drake equation: How many alien civilizations exist? Are we alone?

It is a question that has occupied mankind for centuries. Today, we live in an age of exploration, where robots on Mars and planet-hunting telescopes are beginning to allow us to edge closer to an answer. While we wait to establish contact, one technique we can use back on Earth is an equation that American astronomer Frank Drake formulated in the 1960s to calculate the number of detectable extraterrestrial civilizations may exist in the Milky Way galaxy.

It is not a rigorous equation, offering a wide range of possible answers. Instead it is more a tool used to help understand how many worlds might be out there and how those estimates change as missions like Kepler, a telescope that is currently searching for Earth-like planets, begin to discover more about our universe. Great Filter. The idea was first proposed in an online essay titled, "The Great Filter - Are We Almost Past It? " written by economist Robin Hanson. The first version was written in August 1996 and the article was last updated on September 15, 1998. Since that time, Hanson's formulation has received recognition in several published sources discussing the Fermi paradox and its implications. Main argument[edit] Fermi paradox[edit] There is currently no conclusive evidence aliens have visited Earth and we have observed no intelligent extraterrestrial life with current technology nor has SETI found any transmissions from other civilizations.

Our planet and solar system, however, don't look substantially colonized by advanced competitive life from the stars, and neither does anything else we see. Life is expected to expand to fill all available niches. The Great Filter[edit] According to the Great Filter hypothesis at least one of these steps - if the list were complete - must be improbable. See also[edit] The Great Filter. Sept. 15, 1998 by Robin Hanson Humanity seems to have a bright future, i.e., a non-trivial chance of expanding to fill the universe with lasting life. But the fact that space near us seems dead now tells us that any given piece of dead matter faces an astronomically low chance of begating such a future. There thus exists a great filter between death and expanding lasting life, and humanity faces the ominous question: how far along this filter are we?

Combining standard stories of biologists, astronomers, physicists, and social scientists would lead us to expect a much smaller filter than we observe. Thus one of these stories must be wrong. Introduction Fermi, Dyson, Hart, Tipler, and others [Finney & Jones, Dyson 66, Hart 75, Tipler 80] have highlighted the relevance to SETI (the search for extraterrestrial intelligence) of the "The Great Silence" [Brin 83] (also known as the Fermi paradox), the fact that extraterrestrials haven't substantially colonized Earth yet.

Life Will Colonize. [1304.3381] Life Before Earth. Drake Equation Estimates. Moore's Law and the Origin of Life. Here’s an interesting idea. Moore’s Law states that the number of transistors on an integrated circuit doubles every two years or so. That has produced an exponential increase in the number of transistors on microchips and continues to do so. But if an observer today was to measure this rate of increase, it would be straightforward to extrapolate backwards and work out when the number of transistors on a chip was zero. In other words, the date when microchips were first developed in the 1960s. A similar process works with scientific publications. Between 1990 and 1960, they doubled in number every 15 years or so. Today, Alexei Sharov at the National Institute on Ageing in Baltimore and his mate Richard Gordon at the Gulf Specimen Marine Laboratory in Florida, have taken a similar to complexity and life.

That raises an interesting question. Sharov and Gordon say that the evidence by this measure is clear. Of course, there are many points to debate in this analysis. Dyson Microcosm by ~justravelin on deviantART. Dyson_Microcosm_by_justravelin.png (Image PNG, 1280x960 pixels) - Redimensionnée (79. Astronomers Find First Evidence of Other Universes. There’s something exciting afoot in the world of cosmology. Last month, Roger Penrose at the University of Oxford and Vahe Gurzadyan at Yerevan State University in Armenia announced that they had found patterns of concentric circles in the cosmic microwave background, the echo of the Big Bang.

This, they say, is exactly what you’d expect if the universe were eternally cyclical. By that, they mean that each cycle ends with a big bang that starts the next cycle. In this model, the universe is a kind of cosmic Russian doll, with all previous universes contained within the current one. That’s an extraordinary discovery: evidence of something that occurred before the (conventional) Big Bang. Today, another group says they’ve found something else in the echo of the Big Bang. These bubbles probably had a violent past, jostling together and leaving “cosmic bruises” where they touched. Again, this is an extraordinary result: the first evidence of universes beyond our own. Ref: Galerie des Futurs - A la recherche des extra-terrestres. 1787_09_03_11_11_34_53.jpeg (Image JPEG, 1200x900 pixels)

Have We Found The Universe That Existed Before The Big Bang? Simulation hypothesis. Fractal_dyson_sphere_by_eburacum45-d2yum16.jpg (Image JPEG, 900x573 pixels) Scientists suggest we might be overlooking alien communications. UC Irvine Feature: Beacons. Self-replicating alien probes could already be here. Fermi’s Paradox and Aristotle | George Zarkadakis. Zoo hypothesis. Rare Earth hypothesis. Astrobiologists Find Ancient Fossils in Fireball Fragments. Planetarium hypothesis.