“They are transmitting radio waves, just as we are”: A radio astronomer explains how extraterrestrial civilizations could reach Earth inadvertently

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The core of the Milky Way as captured by the MeerKAT radio telescope. Were humans capable of perceiving radio waves, the heavens would be illuminated constantly, day and night, with visible magnetic field lines, remnants of stellar explosions, and energized gas.(Image credit: NASA, ESA, CSA, STScI, SARAO, Samuel Crowe (UVA), John Bally (CU), Ruben Fedriani (IAA-CSIC), Ian Heywood (Oxford))

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