Astrobiologists suggest that while the universe likely contains many habitable planets, life on these planets may be short-lived due to extreme environmental changes. The discussion raises questions about the effectiveness of the Search for Extraterrestrial Intelligence (SETI), with some arguing that intelligent life may exist but choose not to communicate or broadcast signals. The idea that advanced civilizations could have developed sustainable technologies that minimize energy waste is also presented. Additionally, the conversation explores the possibility of life forms evolving in environments vastly different from Earth, leading to unique forms of intelligence that may not rely on technology as humans do. Ultimately, the silence of potential alien civilizations could stem from their advanced understanding of sustainability and communication.