Eli5: The radio transmission sent out in space 40 years ago

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Why was it specifically 40 years and how does a radio signal get back to you being sent out in space?

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Anonymous 0 Comments

The hope was that aliens living near Altair, a star 17 light years away, would by now have had time to decipher the message and send a return.

The date is significant in Japanese culture: it’s Tanabata, or their “Star Festival”.

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