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Should we be messaging the stars?

Humans currently have the capability to blast powerful messages into space that will travel hundreds and thousands of light years and fall on the ears, eyes, and radio telescopes of possible habitable worlds. A group called METI wants to do just that…to say a bracing “hello” to whoever is out there listening. But not everyone, starting with Elon Musk and Stephen Hawking, thinks this is such a good idea.
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