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发表于 2018-6-13 22:22:02
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孙啸所说的那种生命形式在天文学界是有人考虑过的。
“If we assume that an alien has control of its own appendages, or more generally, if we assume the organism functions coherently as a system, then its size would ultimately be constrained by its ability to send signals within itself at the speed of light - the fastest allowable speed in the universe. For an admittedly extreme example, if an organism were as big as the entire solar system (about 10 light-hours across), and if it wanted to scratch its head, then this simple act would take no less than 10 hours to accomplish. ”
出自https://www.nasa.gov/vision/universe/starsgalaxies/search_life_I.html
Neil deGrasse Tyson于2003年写的,对天文有浓厚兴趣的人不可能没听说过他,然而他应该不是第一个想到行星系和更大尺度生物的天文学家。 |
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