astro20 chap27 - Las Positas College
... fraction of planets with intelligent life that develops technology – don’t know how many early human civilizations failed to develop technology – the fact the many independent early civilizations did develop technology makes us believe ~ 1 ...
... fraction of planets with intelligent life that develops technology – don’t know how many early human civilizations failed to develop technology – the fact the many independent early civilizations did develop technology makes us believe ~ 1 ...
Intelligent Life in the Milky Way Galaxy
... Individuals with traits that best allow them to survive and reproduce will on average produce the greatest number of surviving offspring. ...
... Individuals with traits that best allow them to survive and reproduce will on average produce the greatest number of surviving offspring. ...
There are numerous other ways in which human civilization could
... Biologists have studied the species migration ...
... Biologists have studied the species migration ...
Implications of the Search and Discovery
... • 2 to the 40th power is over a trillion • If it takes 10,000 years for a colony to achieve interstellar travel, 40 doubling times is only 400,000 years. • So why aren’t they all around us? – Recall the Fermi Paradox ...
... • 2 to the 40th power is over a trillion • If it takes 10,000 years for a colony to achieve interstellar travel, 40 doubling times is only 400,000 years. • So why aren’t they all around us? – Recall the Fermi Paradox ...
File
... • Can be estimated by dividing current number of stars in Galaxy by the 10 Ga lifetime of our Galaxy. • We obtain a formation rate of 10 stars ...
... • Can be estimated by dividing current number of stars in Galaxy by the 10 Ga lifetime of our Galaxy. • We obtain a formation rate of 10 stars ...
File
... • Many experiments have been done in which energy has been applied to a mixture of compounds found in atmosphere of early Earth. • These experiments have created amino ...
... • Many experiments have been done in which energy has been applied to a mixture of compounds found in atmosphere of early Earth. • These experiments have created amino ...
Day_39
... civilization capable of IS communication at some time has arisen. • fnow -Fraction of habitable planets with civilization now, not in the past. ...
... civilization capable of IS communication at some time has arisen. • fnow -Fraction of habitable planets with civilization now, not in the past. ...
25drake6s
... R* = Number of stars in the galaxy fp = ne = Average number of suitable planets per star fl = Fraction of suitable planets on which life evolves fi = fc = Fraction that can communicate fL = Lifetime of civilization / Lifetime of star ...
... R* = Number of stars in the galaxy fp = ne = Average number of suitable planets per star fl = Fraction of suitable planets on which life evolves fi = fc = Fraction that can communicate fL = Lifetime of civilization / Lifetime of star ...
Where Is Everybody? - Center for Peripheral Studies
... Where is everybody? The theoretical physicist Enrico Fermi posed this question some fifty years ago (in what has become known as the “Fermi Paradox”), at a time when the scientific community was still reeling from the discoveries of Edwin Hubble and his two hundred-inch telescope. Through that instr ...
... Where is everybody? The theoretical physicist Enrico Fermi posed this question some fifty years ago (in what has become known as the “Fermi Paradox”), at a time when the scientific community was still reeling from the discoveries of Edwin Hubble and his two hundred-inch telescope. Through that instr ...
Blinn College Department of Physics
... Most of the factors are highly uncertain. Possible results range from 1 communicative civilization within a few dozen light years to us being the only communicative civilization in the Milky Way. ...
... Most of the factors are highly uncertain. Possible results range from 1 communicative civilization within a few dozen light years to us being the only communicative civilization in the Milky Way. ...
Document
... - probably not unique or necessary - probably common - even one third of all stars is a huge number. - no reason to think that such events would not occur ...
... - probably not unique or necessary - probably common - even one third of all stars is a huge number. - no reason to think that such events would not occur ...
Johnnie French Lab 1
... o Seti – Search for extraterrestrial intelligence. According to www.seti.org their mission “is to explore, understand and explain the origin, nature and prevalence of life in the universe.” o Fermi Paradox – The contradiction between high estimates of intelligent life in the universe and the lack of ...
... o Seti – Search for extraterrestrial intelligence. According to www.seti.org their mission “is to explore, understand and explain the origin, nature and prevalence of life in the universe.” o Fermi Paradox – The contradiction between high estimates of intelligent life in the universe and the lack of ...
33_drake
... spectrum. Here natural noise is relatively small. Radio communication over interstellar distances is feasible with present technology! ...
... spectrum. Here natural noise is relatively small. Radio communication over interstellar distances is feasible with present technology! ...
life
... •We have the ability to destroy civilization •We are also damaging our environment •We are using up non-renewable resources •Civilizations may “mature” – some evidence •Sustainable civilizations is technically possible ...
... •We have the ability to destroy civilization •We are also damaging our environment •We are using up non-renewable resources •Civilizations may “mature” – some evidence •Sustainable civilizations is technically possible ...
Lecture 27 (pdf from the powerpoint)
... •Estimated by Drake as 0.5. It is now known from modern planet searches that at least 10% of sunlike stars have planets, and the true proportion may be much higher, since only planets gas-giant size and larger can be detected with current technology.[3] •ne = Estimated by Drake as 2. The same paper ...
... •Estimated by Drake as 0.5. It is now known from modern planet searches that at least 10% of sunlike stars have planets, and the true proportion may be much higher, since only planets gas-giant size and larger can be detected with current technology.[3] •ne = Estimated by Drake as 2. The same paper ...
astronomy final exam - Physics and Astronomy
... What is the characteristic molecule called which carries the code of LAWKI? What are it's properties? What would best be the best means of communication between other intelligent species in the galaxy and us? A cell's DNA molecules are constructed of what materials? What is the water hole? If our ra ...
... What is the characteristic molecule called which carries the code of LAWKI? What are it's properties? What would best be the best means of communication between other intelligent species in the galaxy and us? A cell's DNA molecules are constructed of what materials? What is the water hole? If our ra ...
Where Are They?
... If the machines travel at a speed of nc (n<1), then they will visit very star and planet in the galaxy is a time given by Rg/n, where Rg is the radius of the galaxy in light years. Rg ~ 100,000 ly for our galaxy. For n = 0.01, every star will be visited in <107 years. (We have reached n=0.0001) ...
... If the machines travel at a speed of nc (n<1), then they will visit very star and planet in the galaxy is a time given by Rg/n, where Rg is the radius of the galaxy in light years. Rg ~ 100,000 ly for our galaxy. For n = 0.01, every star will be visited in <107 years. (We have reached n=0.0001) ...
Life: Definition, Origin, Criteria
... • The SETI project to search for radio signals from outer space ...
... • The SETI project to search for radio signals from outer space ...
Life: Definition, Origin, Criteria
... • The SETI project to search for radio signals from outer space ...
... • The SETI project to search for radio signals from outer space ...
Life: Definition, Origin, Criteria
... • The SETI project to search for radio signals from outer space ...
... • The SETI project to search for radio signals from outer space ...
Document
... He is a member of the National Academy of Sciences where he chaired the Board of Physics and Astronomy of the National Research Council (1989-92). Frank also served as President of the Astronomical Society of the Pacific. He was a Professor of Astronomy at Cornell University (1964-84) and served as ...
... He is a member of the National Academy of Sciences where he chaired the Board of Physics and Astronomy of the National Research Council (1989-92). Frank also served as President of the Astronomical Society of the Pacific. He was a Professor of Astronomy at Cornell University (1964-84) and served as ...
Fermi paradox
The Fermi paradox (or Fermi's paradox) is the apparent contradiction between high estimates of the probability of the existence of extraterrestrial civilizations, such as in the Drake equation, and the lack of evidence for such civilizations. The basic points of the argument, made by physicists Enrico Fermi and Michael H. Hart, are: The Sun is a typical star, and there are billions of stars in the galaxy that are billions of years older. With high probability, some of these stars will have Earth-like planets, and if the earth is typical, some might develop intelligent life. Some of these civilizations might develop interstellar travel, a step the Earth is investigating now. Even at the slow pace of currently envisioned interstellar travel, the Milky Way galaxy could be completely traversed in about a million years.According to this line of thinking, the Earth should already have been visited by extraterrestrial aliens though Fermi saw no convincing evidence of this, nor any signs of alien intelligence anywhere in the observable universe, leading him to ask, ""Where is everybody?""