The Green Bank Telescope captured emissions from around 11,680 stars and their planetary systems that lay between 5,385 and 18,173 light-years away. The observations occurred during two-hour sessions on April 22, 202, April 28, 2021, May 22, 2022, and May 13, 2023. They did two scans of about 2.5 minutes each on selected pairs of sources. Then, they processed the data, which included about 37 million narrowband detections of emissions. The resulting conclusion was that there are no advanced civilizations nearby that are transmitting in that range of frequencies.
