BBC Sky at Night Magazine on MSN
Aliens could detect our airports. Scientists say radar signals could reveal our presence across the galaxy
Planet Earth could be giving out its own signals, which could in turn be detected by distant astronomers on an alien planet ...
See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Radar systems used by civilian airports and military operations may be ...
Airport radar systems used daily at major hubs including London Heathrow and New York's JFK could be unintentionally ...
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