Yes, that's why I said "tremendous challenge it will be" and not "it would be", because I'm confident that some day the human race will find a way to the stars.

For a moment, please let's go back to phantasy, which is one of the most productive and fascinating territories of the mind. If there is a hole in the time-space, a worm tunnel through which some energy could travel through transformations, then it is not reasonable to expect solid ships and material creatures to visit us, or to send to the stars. It would be reasonable to find other forms of energy containing a message. Measurable energy, repeatable experiments. Perhaps we are immersed in signals from another civilization, and can't see them because we have not reached the threshold technology, as a primitive Martian who lives in a place bombarded by our radio and TV transmissions and can't notice them because he doesn't know how to build a receiver.

The chances of being "focused" by transmissions from outer space are extremely low, because they would need to SPOT us, but the first signal of life that we have sent to space is very weak, responds to relativity laws, and have been travelling only 80 years or so. Did they discover a way to send a wide and strong signal to large areas? May be.

Un abrazo,
Andrés