Alien civilizations may have explored the Milky Way and visited Earth already, new study claims
Link: https://www.foxnews.com/science/alien-civilizations-explored-milky-way-earth-already
Our Milky Way galaxy could be filled with alien civilizations, a new study claims, but we don’t know because they haven’t stopped by Earth for a visit in millions of years.
According to a study published last month in The Astronomical Journal, extraterrestrial life might be taking its time to fully explore the galaxy, even using the movement of star systems to make this type of journey easier.
The scientists’ work is the latest response to what’s known as the Fermi paradox, which wonders why we have yet to detect signs of alien life.
Italian-American physicist Enrico Fermi famously said something to the effect of, “But where is everybody?” in reference to the possibility of star-hopping space aliens.
The new study claims the aliens may just be taking their time and being strategic.
“If you don’t account for 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, told Business Insider. “Either nobody leaves their planet, or we are in fact the only technological civilization in the galaxy.”
Stars, along with the planets around them, orbit the center of the Milky Way on unique paths at varying speeds, and they sometimes zip past one another as they do, Business Insider reports.
Carroll-Nellenback’s study points out that the aliens could simply be waiting for their next destination to come closer to them.
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The theories and principles in the Drake equation are closely related to the Fermi paradox.[34] The equation was formulated by Frank Drake in 1961 in an attempt to find a systematic means to evaluate the numerous probabilities involved in the existence of alien life.
The speculative equation considers the rate of star formation in the galaxy; the fraction of stars with planets and the number per star that are habitable; the fraction of those planets that develop life; the fraction that develop intelligent life; the fraction that have detectable, technological intelligent life; and finally the length of time such communicable civilizations are detectable. The fundamental problem is that the last four terms are completely unknown, rendering statistical estimates impossible.