Are we alone? Billions stars in the universe!

There are billion stars in the universe and human has sent so many satelites, space telescope, transmitters into space. We just do not has anything or no one detect us. Are we in the universe alone? Are we in 4th dimensions that cannot discover anything beyond 5th dimensions? As we stuck in a unique dimensions as a result of multiple universe of string theory? Or indeed the reality is just an illusion?

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