Alien Civilizations in Universe. Introduction This calculation is just a rough one because galaxies vary a lot.
There are also things called globular clusters that can contain hundreds of thousands of stars. I will be talking about type 0, type 1, type 2 and type 3 civilizations here. You might want to watch this video to understand exactly what that means: Kardashev scale civilizations, type 0,1,2,3 civilizations and beyond Shortened link to video: ⊗ Kardashev scale civilizations, type 0,1,2,3 civilizations and beyond [our possible future, video + music]: The Number of Civilizations in Our Galaxy & the Universe To calculate the numbers of advanced alien civilizations in a galaxy that want to communicate with us we use a thing called the Drake Equation. 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. Einstein for Everyone. Einstein for Everyone Nullarbor Press 2007revisions 2008, 2010, 2011, 2012, 2013 Copyright 2007, 2008, 2010, 2011, 2012, 2013 John D.
Norton Published by Nullarbor Press, 500 Fifth Avenue, Pittsburgh, Pennsylvania 15260 with offices in Liberty Ave., Pittsburgh, Pennsylvania, 15222 All Rights Reserved John D. An advanced sequel is planned in this series:Einstein for Almost Everyone 2 4 6 8 9 7 5 3 1 ePrinted in the United States of America no trees were harmed web*bookTM This book is a continuing work in progress.
January 1, 2015. Preface For over a decade I have taught an introductory, undergraduate class, "Einstein for Everyone," at the University of Pittsburgh to anyone interested enough to walk through door. With each new offering of the course, I had the chance to find out what content worked and which of my ever so clever pedagogical inventions were failures.
At the same time, my lecture notes have evolved. This text owes a lot to many. I i i. Mars Science Laboratory, the Next Mars Rover.