Extraterrestrial CivilizationsIsaac Asimov concludes that we are not alone! Using the most up-to-date astronomical research as the backdrop for speculation, Asimov confronts the possibilities of other-worldly life head-on in Extraterrestrial Civilizations. In what will surely become one of the most provocative books ever written on the possibilities of life elsewhere in the universe, the incomparable Isaac Asimov provides chilling, hopeful, and exciting new insights. Here is astounding speculation about where the next giant step for mankind will take us. . . . Praise for Extraterrestrial Civilizations “[Isaac] Asimov holds our attention as he builds a meticulous case. We are not alone. It’s just a matter of time until we know for sure.”—Miami Herald "Intriguing"—Publishers Weekly |
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acceleration animals appear astronomer atmosphere atoms billion binary body called carbon century chance changes circling civilization close clouds combination complex consider course detected develop direction distance Earth ecosphere effect energy entire equal evidence exist extraterrestrial fact Galaxy giant gravitational greater habitable happens heat human hydrogen imagine increasing intelligence interstellar Jupiter kilometers land larger least less light liquid living look Mars mass massive material matter means miles million molecules Moon move natural nearly objects observed once orbit organisms original oxygen particles passed percent perhaps planet planetary system Population possible present probes produced radiation reach reason remain result rotation satellites seemed settlements side signals smaller Solar system space species speed stars suggested suppose sure surface temperature theory things thought turned Universe Venus volatiles