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well, consider what our technology can scan and listen to in space. We can point a radio telescope at a distant star, a very huge object, and the dish, the signal reciever can focus a narrow beam into that star, gathering information and returning it to earth. It is amazing how we can hear pulsars or neutron stars far off in space.
NOW try focusing that beam onto a small earth sized planet some 50 light years away. Even better try focusing it on where a spaceship around that platet (if we could find one) Might be at any given time. Makes the proverbial needle in a haystack routine seem like childsplay by comparison.
realistically there probably are planets with life on them. After all, we are here. But getting to and communicating with them using our current technology is more a dream than a reality. So far.
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