degradation
发表于 2025-3-23 11:45:44
Funktionsstörungen des unteren Harntraktesgs across interplanetary distances. Now we know that such journeys are possible for a civilization at our level of technological development. We already have landed men on Earth’s moon and are planning to transport humans to Mars. We also know that the home planets of alien civilizations, if they ex
CONE
发表于 2025-3-23 17:41:03
Hans Palmtag,Mark Goepel,Helmut Heidlerumption that technological civilizations do not expand beyond their home systems. The density of such civilizations was determined by the number of separate evolutions to life and intelligence. The equation did not take into account the possibility of interstellar exploration, interstellar colonizat
不愿
发表于 2025-3-23 19:45:55
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fatuity
发表于 2025-3-24 01:43:55
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Temporal-Lobe
发表于 2025-3-24 05:50:48
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牛马之尿
发表于 2025-3-24 07:18:51
978-1-4419-2107-9Springer-Verlag New York 2007
OREX
发表于 2025-3-24 13:45:05
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大气层
发表于 2025-3-24 18:38:57
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察觉
发表于 2025-3-24 22:57:38
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飓风
发表于 2025-3-25 02:02:56
The Drake Equation, Take Three,umption that technological civilizations do not expand beyond their home systems. The density of such civilizations was determined by the number of separate evolutions to life and intelligence. The equation did not take into account the possibility of interstellar exploration, interstellar colonization, and direct contact.