It has been over sixty years since Dr.
bits/sec within a 10 billion light-years radius.
"However, the radio telescopes' field of view was much larger than the apparent size of the target stars, allowing them to simultaneously observe other galaxies in the background. Therefore, we analyzed the number of stellar systems based on the background galaxies, assuming that advanced civilizations would have the capacity to send us signals from other galaxies. Our statistical analysis suggests that BL may have observed hundreds of trillions of stellar systems.
"Our statistical method suggests that less than one in hundreds of trillions of extragalactic civilizations within 969 Mpc possess a radio transmitter above 7.7 x 10W of power, assuming one civilization per one-solar-mass stellar system.
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