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Getting a Message Across the Universe: Would E.T. Send a Letter?

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Illustration shows message in a bottle, Earth in background.

For long messages sent very far away, it saves energy to send a physical package rather than radio waves. The longer the message, and the farther the distance, the more advantageous it is to send a "message in a bottle."

Credit: Nicolle Rager-Fuller, National Science Foundation

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