Surely all the stuff we use as resources would be valuable to any aliens, and we give off plenty of signals we're here.
I understand that scientists have ruled out traveling at light speed, and I'm happy to go along with that line of reasoning. However, some of the same scientists have said that it would be theoretically possible to travel great distances with wormholes and other such Star Trek like nonsense.
Obviously the chances of this are pretty remote, but so are the chances of a lot of things.
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