If an extraterrestrial technological civilization heard any terrestrial broadcast, we would receive a response 2,000 years later

According to the calculation of Harvard astronomers Amir Siraj and Abraham Loeb, if an alien technological civilization heard any transmission from Earth, it would take more than 2,000 years to get an answer . The researchers refer to the extraterrestrial intelligences that would be motivated to send messages to Earth in response to the detection … Read more