![]() ![]() ![]() If there is, Hart said, it would require a sociological explanation for why they did not colonize the galaxy when they have had ample chance to do so. In fact, the paper argues, the absence of aliens on Earth could be seen as evidence that there is no alien life out there. If this is anywhere close to correct, and given that our galaxy is around 13.6 billion years old, it's puzzling that there is no evidence that we have found of extraterrestrial civilizations. We see that if there were other advanced civilizations in our Galaxy they would have had ample time to reach us, unless they commenced space exploration less than 2 million years ago."Īmateur Astronomer Captures Large Flash As Something Slams Into Jupiter If we assume that the time between voyages is of the same order as the length of a single voyage, then the time needed to span the Galaxy will be roughly doubled. At that rate, most of our Galaxy would be traversed within 650,000 years. "If there were no pause between trips, the frontier of space exploration would then lie roughly on the surface of a sphere whose radius was increasing at a speed of 0.10c. (These are all within 20 light-years of the Sun.) Each of these colonies has the potential of eventually sending out their own expeditions, and their colonies in turn can colonize, and so forth," Hart writes. "Assume that we eventually send expeditions to each of the 100 nearest stars. ![]() In the paper, titled "An Explanation for Absence of Extraterrestrials on Earth", Hart argues that if a civilization tried, it would be able to colonize the galaxy in a relatively short time-span. One take on the Fermi Paradox, cited in the new pre-print paper published on Arxiv, came from astrophysicist Michael Hart in 1974. ![]()
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