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karotop02 karotop02
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3 months ago

Which of the following limits the number of technological civilizations in our galaxy?



the lifetime of M dwarf stars



the number of satellite galaxies of the Milky Way



the fraction of civilizations that wish to communicate with others



the number of planets per star in a habitable zone for longer than a few billion years

Textbook 
ASTRO

ASTRO


Edition: 3rd
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sherry94sherry94
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3 months ago
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karotop02 Author
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3 months ago
Thanks
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Yesterday
Thanks for your help!!
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2 hours ago
Good timing, thanks!
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