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Home Q & A Board Science-Related Homework Help Physics Astronomy
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adreamer adreamer
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7 years ago
The Drake equation allows us to estimate the number of
A) intelligent civilizations that have existed in our galaxy during its entire lifetime
B) habitable planets on which life has arisen
C) intelligent civilizations capable of traveling to the Earth
D) intelligent civilizations capable of communicating in our galaxy now
Textbook 
Life in the Universe

Life in the Universe


Edition: 4th
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19Clyde19Clyde
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7 years ago
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adreamer Author
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7 years ago
Just got PERFECT on my quiz
julymontalvo
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Yesterday
Thank you, thank you, thank you!
Butwhy
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2 hours ago
Smart ... Thanks!
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