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Published online 1 September 2004 | Nature | doi:10.1038/news040830-4
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ET write home
Mail, not phone, might be best for interstellar messages.
If an extra terrestrial wanted to send a field report describing all she had learned about Earth, she might be better off writing rather than phoning. A new analysis has concluded that a physical object would be a more efficient way to send a long message to the stars than a beam of radio waves.
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