NASA Uses Powerful Transmitters to Talk to Deep Space Spacecraft. Will Other Civilizations Receive Those Signals? - by ET_Exists
“This work [2019 study] identifies the stars that interstellar spacecraft will closely encounter on their paths through the universe,” Derrick recently told. “Our paper expands upon this idea by identifying which stars the terrestrial transmissions to interstellar spacecraft will encounter. These transmissions cover a wider volume of the surrounding universe, meaning they will encounter more stars.
“In addition, we focus on directed transmissions to space, while the majority of the electromagnetic energy that travels away from the Earth goes out in all directions,” Dr. Howard Isaacson, who is a researcher in the Astronomy Department at UC Berkeley, recently told. “This focused energy will produce a stronger signal when it reaches nearby stars.
The five stars that Derrick expects Earth to potentially receive a reply by the end of this century are all located within 50 light-years of Earth, and the two additional stars for which Derrick expects a potential reply within the next 100 years are located within 73 light-years of Earth, which are both relatively short distances in terms of cosmic scales.
“Indeed, the pursuit of these types of questions, including our recent discovery that one of five stars like the Sun has a planet like the Earth, have only been possible to answer with modern technology,” Dr. Isaacson tells. “We now have the capability of detecting technology from a distant civilization and that is really profound. This study is a contribution to that pursuit.
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