How common are technological civilizations?
نویسندگان
چکیده
منابع مشابه
How Common Are Earths? How Common Are Jupiters?
Among the billions of planetary systems that fill the Universe , we would like to know how ours fits in. Exoplanet data can already be used to address the question: How common are Jupiters? Here we discuss a simple analysis of recent exoplanet data indicating that Jupiter is a typical massive planet rather than an outlier. A more difficult question to address is: How common are Earths? However,...
متن کاملHow common are common priors?
Article history: Received 30 November 2007 Available online 31 August 2011 JEL classification: D82 D83
متن کاملHow common are the "common" neurologic disorders?
OBJECTIVE To estimate the current incidence and prevalence in the United States of 12 neurologic disorders. METHODS We summarize the strongest evidence available, using data from the United States or from other developed countries when US data were insufficient. RESULTS For some disorders, prevalence is a better descriptor of impact; for others, incidence is preferable. Per 1,000 children, ...
متن کاملHow common are overdominant mutations?
dominance (heterozygote superiority) of EMS-induced quence of these assumptions is that beneficial mutations mutations. A number of other authors have made claims have higher dominance (1 h) than do deleterious for overdominance of induced or spontaneous mutaones (h). This stems from the simple and arguably reations (see Peters et al. 2003 for references). For examsonable assumption that delete...
متن کاملHow Inevitable Is A “Clash of Civilizations”?
The period since September 11 attacks in 2001 has witnessed intense debates over to what extent a ―clash of civilizations‖ is inevitable. This paper argues that the ―clash of civilizations‖ thesis is a mistaken paradigm of understanding the Post-Cold War international order. While cultural and religious identities have increasingly become a source of political mobilization in the Post-Cold War ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Geophysics
سال: 1997
ISSN: 1468-4004,1366-8781
DOI: 10.1093/astrog/38.4.24