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Originally Posted by biker1
The extreme numbers of galaxies (200 billion to 2 trillion) and the number of stars within a typical galaxy (100 billion) would suggest a high probability that life of some form exists elsewhere. The extreme distances of space would suggest a low probability that any extraterrestrial life has visited here. Our own galaxy is 100,000 light-years across. The nearest solar system is over 4 light-years away. Achieving any significant percentage of the speed of light will require some extremely advanced technology. Also, keep in mind that once you accelerate to speed, you must decelerate and that takes time. Wormholes are a mathematical bi-product and may or may not exist let alone be created and utilized. I suspect there is a low probability that an advanced civilization would find that there is a compelling reason to expend the resources to visit here if they had the capability. Regarding advertising our existence, electromagnetic energy has only been transmitted from earth for about 50 years. Therefore, the signals have only reached out in a sphere of diameter 100 light-years. This isn’t very far. Also, there is the issue of decreasing signal to noise.
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There have been a number of scify stories about starships or fleets of starships, traveling at sub-light speed, carrying massive numbers of human migrants to populate a new world and leaving a dieing Earth behind. The stories are of multi-generational searches for an Earth 2.0. Migration of our species to a new world would likely be a one way trip, regardless of travel speed. Pioneers of a new age. 👩*🚀🧑*🚀👽🤖