The Earth's Calling Card: Our 50-Lightyear Electronic 'ET' Billboard![]() Science & Tech Hans - 581 days ago - dailygalaxy.com Stephen Hawking has voiced concern about the dangers, he believes, are posed by alien predators who may arrive in giant space ships, to conquer, enslave, destroy, colonize, and voraciously exploit the resources of Earth, an assertion that is analogous
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