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- TL;DR Summary
- Can we send a signal to nearby stars?
I have been wondering what it would take to send a radio signal that could be detected from a neighboring star system (for example, Alpha Centauri, ~4.3 light-years away).
I am only thinking about conventional radio communication and would like to know if there are existing calculations or real-world examples (such as planetary radar or deep-space communication) that provide a useful comparison.
The reason for the question is actually the other way around; Can we reasonably expect to receive radio signals from intelligent life on other stars (if it exists at all)?
- Transmitter size: How large would a transmitting antenna or array need to be for such a signal to be detectable above background noise?
- Energy requirements: How much transmission power would be required for detection using a large, modern radio telescope at the receiving end?
- Feasibility: Could this power realistically be generated and sustained with current or near-future technology?
I am only thinking about conventional radio communication and would like to know if there are existing calculations or real-world examples (such as planetary radar or deep-space communication) that provide a useful comparison.
The reason for the question is actually the other way around; Can we reasonably expect to receive radio signals from intelligent life on other stars (if it exists at all)?