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The 21-сm line of atomic Hydrogen is very common throughout the Universe that some scientists suggest that if we want to
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The 21-сm line of atomic Hydrogen is very common throughout the Universe that some scientists suggest that if we want to
The 21-сm line of atomic Hydrogen is very common throughout the Universe that some scientists suggest that if we want to send messages to aliens we should use the frequency of it times this frequency (why?). What is the frequency they suggest to use? 2.75 GHz O 3.62 GHz O 4.49 GHz O 1.43 GHz
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