<ul><li>21cm radiation, connected to hydrogen spin flip, has the potential to be a universal language for communication with aliens.</li><li>Hydrogen atom's electron flipping its spin releases energy at a wavelength of 21 centimeters.</li><li>The advantage of 21cm radiation is its ability to penetrate interstellar dust, making it ideal for long-distance communication.</li><li>The use of 21cm radiation as a communication method relies on the hope that aliens will understand the hydrogen spin-flip transition.</li></ul>

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