Sorry I’d im way off here. But if we are looking at other systems and galaxies such as the andromeda system, why should we expect contact? If the light we are seeing from andromeda is two million years old, wouldn’t any communication take much longer?
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First, people don’t generally look at other galaxies when searching for life. That is just way too far away to get enough information. But when looking at relatively nearby star systems within our galaxy for signs of life they aren’t seeking two-way communication. Instead they are looking for things such as radio signals, or atmospheric traces that indicate life could exist.
For example an alien species looking at Earth could notice that as soon as we discovered radio we started constantly blasting radio signals in every direction. Anyone listening could pick those up, and if aliens similarly discovered radio then we might expect to detect similar encoded signals. Life on Earth has also significantly altered our atmosphere; even more than our modern pollution, we have an atmosphere rich in oxygen which is a good sign biological activity is happening. Even an extremely distant observer could look at light reflecting off Earth or passing through the atmosphere and determine our atmospheric composition, and from that deduce something was living here.
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