Open AccessHow common are technological civilizations?
Author(s) -
Ian Crawford
Publication year - 1997
Publication title -
astronomy and geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.168
H-Index - 22
eISSN - 1468-4004
pISSN - 1366-8781
DOI - 10.1093/astrog/38.4.24
Subject(s) - humanity , milky way , astrobiology , planet , galaxy , environmental ethics , epistemology , philosophy , astronomy , biology , physics , theology
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