The Search for The Search for ExtraTerrestrial IntelligenceExtraTerrestrial Intelligence(Do Extraterrestrials know humans Exist?)(Do Extraterrestrials know humans Exist?)

By Dr. Harold Williams By Dr. Harold Williams of Montgomery College Planetariumof Montgomery College Planetarium

http://montgomerycollege.edu/Departments/planet/

at Takoma Park, Maryland, USA, at Takoma Park, Maryland, USA, Planet Earth, (the third major Planet Earth, (the third major

planet) around the star Sol in the planet) around the star Sol in the Milky Way Galaxy in the Local Milky Way Galaxy in the Local

Group and outlying member of the Group and outlying member of the Virgo super cluster in the universe Virgo super cluster in the universe

13.7billion years after creation.13.7billion years after creation.

Space contain such a huge supply of atoms that Space contain such a huge supply of atoms that all eternity would not be enough time to count all eternity would not be enough time to count them and the force which drives the atoms into them and the force which drives the atoms into various places just as they have been driven various places just as they have been driven together in this world. So we must realize that together in this world. So we must realize that there are other worlds in other parts of the there are other worlds in other parts of the universe, with races of different men and universe, with races of different men and different animals. Lucretius, Roman different animals. Lucretius, Roman philosopher, 1st century BCE translated by philosopher, 1st century BCE translated by Mary-Kay Gamel.Mary-Kay Gamel.

Heaven and earth are large, yet in the whole of space Heaven and earth are large, yet in the whole of space they are but as small grain of rice. It is as if the whole they are but as small grain of rice. It is as if the whole of empty space were a tree, and heaven and earth were of empty space were a tree, and heaven and earth were one of its fruits. Empty space is like a kingdom, and one of its fruits. Empty space is like a kingdom, and heaven and earth no more than a single individual heaven and earth no more than a single individual person in that kingdom. Upon one tree there are many person in that kingdom. Upon one tree there are many fruits, and in one kingdom many people. How fruits, and in one kingdom many people. How unreasonable it would be to suppose that besides the unreasonable it would be to suppose that besides the heaven and earth which we can see there are no other heaven and earth which we can see there are no other heavens and no other earths?heavens and no other earths?Teng Mu, Chinese philosopher 13th century AD, Teng Mu, Chinese philosopher 13th century AD, translated by Joseph Needhamtranslated by Joseph Needham

It sure would be a It sure would be a waste of space.waste of space.Said by Jodie Foster while Said by Jodie Foster while portraying Ellie Arroway in the portraying Ellie Arroway in the movie “Contact” whose screen movie “Contact” whose screen play was written by Carl Sagan.play was written by Carl Sagan.

Absence of Absence of evidence is not evidence is not evidence for evidence for absence.absence.35 hit on google.com on May 10, 2003. 35 hit on google.com on May 10, 2003. Many but not all on UFO sights.Many but not all on UFO sights.

Extraordinary Extraordinary claims require claims require extraordinary extraordinary evidence.evidence.181,000 hit on google.com on May 181,000 hit on google.com on May 10, 2003. Generally attributed to 10, 2003. Generally attributed to Carl Sagan.Carl Sagan.

Frank DrakeFrank Drake

N = R* fp ne fl fi fc LWhere,N = The number of civilizations in The Milky Way Galaxy whose electromagnetic emissions are detectable.R* =The rate of formation of stars suitable for the development of intelligent life.fp = The fraction of those stars with planetary systems.ne = The number of planets, per solar system, with an environment suitable for life.fl = The fraction of suitable planets on which life actually appears.fi = The fraction of life bearing planets on which intelligent life emerges.fc = The fraction of civilizations that develop a technology that releases detectable signs of their existence into space.L = The length of time such civilizations release detectable signals into space.

Tobacco mosaic, a RNA virus 0.01mm long. Principally composed of CHON.

Microscopic filament resembling modern bacteria found in 3.5-billion-year-old chert of the Pilbara Block in northwestern Australia.

Drawing of modern bacteria similar to microscopic fossil found in 3.5-billion-year-old chert of the Pilbara Block in northwestern Australia.

.

Trilobite the size of a human hand who lived on the ocean floor 400 million year ago during the Cambrian epoch and is now found in a limestone deposit in Pennsylvania.

Stanley Miller in 1999Stanley Miller in 1999

Modern StromatolitesModern Stromatolites

Life zones around different types of stars

Gliese 581

Pioneer spacecraft PlaquePioneer spacecraft Plaque

Voyager Spacecraft PlaqueVoyager Spacecraft Plaque

Arecibo Puerto Rico, http://www.naic.edu/

Atomic hydrogen, 1H

Has a radio transition at 21 centimeters or 1,420 Megahertz,. electron and proton aligned or opposite

Deuterium, 2H, heavy hydrogenHas a radio transition at 93 Centimeters or 327 Megahertz electron and nucleus aligned or opposite

Tritium, 3H, heavy heavy hydrogen

Has a radio transition at 19.6 centimeters or 1,516.7 Megahertz electron and nucleus aligned or opposite

SETI@home bandSETI@home band

Fast Fourier Transform (FFT)Fast Fourier Transform (FFT)

Broad Band Radio Frequency Broad Band Radio Frequency InterferenceInterference

Narrow Radio Frequency Narrow Radio Frequency InterferenceInterference

TripletsTriplets

http://seti.org/ SETI Institutehttp://setiathome.ssl.berkeley.edu/ SETI@homehttp://setiathome.berkeley.edu/sah_glossary.php SETI@home: Glossary of Termshttp://planetary.org/ Planetary Society

What if we detect somethingWhat if we detect somethingDeclaration of Principles Concerning

Activities Following the Detection of Extraterrestrial Intelligence http://www.seti.org/site/pp.asp?c=ktJ2J9MMIsE&b=179287

NOW FOR SOME MUSICNOW FOR SOME MUSICHvdF - Lyrics PageHvdF - Lyrics Pagehttp://www.hvdf.de/lyrics/index.html#dyhu http://www.hvdf.de/lyrics/index.html#dyhu

montgomerycollege.edumontgomerycollege.edu/.../planet//.../planet/Shows/Shows/SETISETI//SETISETI_show.ppt_show.ppt