{"id":769,"date":"2026-06-03T11:18:49","date_gmt":"2026-06-03T11:18:49","guid":{"rendered":"https:\/\/stevewatson.info\/blog\/?p=769"},"modified":"2026-06-04T06:10:55","modified_gmt":"2026-06-04T06:10:55","slug":"classification-scales-for-extraterrestrial-intelligences","status":"publish","type":"post","link":"https:\/\/stevewatson.info\/blog\/2026\/06\/03\/classification-scales-for-extraterrestrial-intelligences\/","title":{"rendered":"Classification Scales for Extraterrestrial Intelligences"},"content":{"rendered":"<p style=\"padding-left: 40px;\"><span style=\"color: #000000;\"><u>Scale\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Property (Variable, Units)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Formula\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Earth&#8217;s Value\u00a0\u00a0<\/u><\/span><\/p>\n<ol>\n<li><span style=\"color: #000000;\">Kardashev\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Energy Consumption (W, Watts)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 K = Log<sub>10<\/sub>W \u2013 6\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 7.3<\/span><\/li>\n<li><span style=\"color: #000000;\">Sagan\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Information Content<\/span><a href=\"#_ftn1\" name=\"_ftnref1\">[1]<\/a> <span style=\"color: #000000;\">(I, bits)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 S = Log<sub>10<\/sub>I \u2013 7\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 7.0<\/span><\/li>\n<li><span style=\"color: #000000;\">Spatial\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Resource Zone <\/span><span style=\"color: #000000;\">(d, km)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Z = Log<sub>10<\/sub>d\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a04.1-5.6<\/span><\/li>\n<\/ol>\n<p><a href=\"#_ftnref1\" name=\"_ftn1\">[1]<\/a> <span style=\"color: #000000;\">Adapted from Carl Sagan (1973) <em>The Cosmic Connection<\/em> c. 34 with his estimates for the comment.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scale\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Property (Variable, Units)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Formula\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Earth&#8217;s Value\u00a0\u00a0 Kardashev\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Energy Consumption (W, Watts)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 K = Log10W \u2013 6\u00a0 \u00a0 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[53],"tags":[],"class_list":["post-769","post","type-post","status-publish","format-standard","hentry","category-interstellar"],"_links":{"self":[{"href":"https:\/\/stevewatson.info\/blog\/wp-json\/wp\/v2\/posts\/769","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stevewatson.info\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stevewatson.info\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stevewatson.info\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stevewatson.info\/blog\/wp-json\/wp\/v2\/comments?post=769"}],"version-history":[{"count":14,"href":"https:\/\/stevewatson.info\/blog\/wp-json\/wp\/v2\/posts\/769\/revisions"}],"predecessor-version":[{"id":783,"href":"https:\/\/stevewatson.info\/blog\/wp-json\/wp\/v2\/posts\/769\/revisions\/783"}],"wp:attachment":[{"href":"https:\/\/stevewatson.info\/blog\/wp-json\/wp\/v2\/media?parent=769"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stevewatson.info\/blog\/wp-json\/wp\/v2\/categories?post=769"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stevewatson.info\/blog\/wp-json\/wp\/v2\/tags?post=769"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}