As you told me in the Last doubt that the earphone has to simply travel the air into your ears but how can it be possible in the space there is no air ? But I heard that the earphones work in space is that true or not?
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Solution
So, no, with just your ears, no hearing through space
but headphones work nonetheless ;) Assuming a vacuum: Some will work. Earphones whose speakers are physically connected to your bone will work to some degree.