权宜之计
发表于 2025-3-23 10:44:27
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使激动
发表于 2025-3-23 14:35:59
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Abnormal
发表于 2025-3-23 19:32:47
N is Neither Very Small nor Very Large is not supported observationally. The suggestion that the lack of extraterrestrial colonists on the earth means that N is very small is examined in detail. It is shown that the interstellar colonization scenario is, in fact, not plausible because even one colony calls for expenditures of energy suf
立即
发表于 2025-3-24 00:09:50
Galactic-Scale Civilization evolution, social evolution, and cultural evolution. In this process, matter becomes organized in increasingly complex ways, and more able to make use of free energy in the environment. In view of this evolution of dissipative structures, of which cells, humans, and mankind are examples, it seems u
传授知识
发表于 2025-3-24 05:10:47
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他日关税重重
发表于 2025-3-24 10:03:35
Uncertainty in Estimates of the Number of Extraterrestrial Civilizations to some extent uncertain. The uncertainty in any quantity may be represented by a probability distribution function, even if that quantity is itself a probability. The uncertainty of current estimates of N is derived principally from uncertainty in estimates of the lifetime of advanced civilization
Finasteride
发表于 2025-3-24 14:26:32
Strategies for SETI Through Radio Waves an Introductionwould have been colonized or at least visited long ago. Of course, followers of Von Däniken believe we . been, while the UFO buffs believe we are . being visited. But a more skeptical faction, finding no solid evidence either for visitation or for astro-engineering on a Dyson scale, concludes that e
大看台
发表于 2025-3-24 16:17:45
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离开可分裂
发表于 2025-3-24 20:51:15
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标准
发表于 2025-3-24 23:17:10
Search for Planets and Early Life in Other Solar Systems an Introductionmental importance to the question of life, because we assume that life may originate and evolve only on planets. If planets were found near other stars, then with the development of proper instruments we could go one step further and search for a spectroscopic evidence of early life on these planets