The speed of light is not impossible; in fact, it is a fundamental constant of the universe and the maximum speed at which information can travel. The reason Earth is hesitant about answering signals from potential extraterrestrial civilizations is not due to the limitations of light speed, but rather stems from a cautious and considered approach to the search for extraterrestrial intelligence (SETI).
There are several reasons for this cautious approach:
Uncertainty: Detecting and interpreting potential signals from extraterrestrial civilizations is a complex task. Any detected signals would need to be thoroughly studied and analyzed to determine their origin and nature. False positives or misinterpretations are possible, so it's important to proceed with careful consideration.
Responsibility: If we were to send a response to an extraterrestrial signal, we would be initiating contact with a civilization whose intentions and capabilities are unknown to us. This carries potential risks and ethical considerations. There are concerns about inadvertently revealing our presence to a potentially advanced and possibly hostile civilization.
International Consensus: Decisions related to transmitting intentional signals to potential extraterrestrial civilizations involve global implications. It would require international consensus and coordination, as it would be a decision that affects humanity as a whole, not just one country or organization.
Limited Resources: Conducting a targeted call and response system with stars closer to us would require significant resources, both in terms of technology and manpower. Currently, the search for extraterrestrial intelligence primarily focuses on passive observation and analysis of signals rather than active transmission.
While the search for extraterrestrial intelligence continues, there are ongoing discussions within the scientific community and organizations like SETI about the appropriate protocols and procedures for initiating contact or responding to potential signals. These discussions take into account a wide range of scientific, ethical, and practical considerations.