Our own civilization might be too young to have encountered extraterrestrial life here on Earth.
— says that Earth may, in fact, have been visited by extraterrestrial life. Unfortunately, human beings weren't around to hold a welcoming committee. , astrophysicist Michael Hart took on the Fermi Paradox and came to the conclusion that there are likely no alien civilizations in the Milky Way.
"If you don't account for the motion of stars when you try to solve this problem, you're basically left with one of two solutions," Jonathan Carroll-Nellenback, a computational scientist and the study's lead author, explained to If that's the case, it could take much longer to spread across the galaxy than previously estimated. As such, aliens may not have reached us. On the other hand, they may have reached us millions of years before humans evolved.
A variety of possibilities were factored into the study. These included the proximity to new star systems, the range and speed of hypothetical interstellar probes, and the rate at which these probes would be launched.
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