The Aliens Need More Time…

Posted by Michael Pinto on Jan 21, 2007 in Science |

An old argument against aliens is that if the galaxy is filled with advanced civilizations they would have already found us. This theiry was first put out by Nobel laureate Enrico Fermi, and is known as Fermi’s paradox. Well now it looks like someone may have an answer to Fermi’s paradox:

Aliens need a lot more time to find us

“Rasmus Bjork of the Niels Bohr Institute in Copenhagen, Denmark, has calculated that eight probes – travelling at a tenth of the speed of light and each capable of launching up to eight sub-probes – would take about 100,000 years to explore a region of space containing 40,000 stars. When Bjork scaled up the search to include 260,000 such systems in our galaxy’s habitable zone, the probes took almost 10 billion years – three-quarters the age of the universe – to explore just 0.4 per cent of the stars.

So, Bjork’s answer to the Fermi paradox: aliens haven’t contacted us because they haven’t had the time to find us yet. He adds that the search could be optimised by visiting only those stars that harbour habitable planets, which could be identified by planet-finding missions such as NASA’s Terrestrial Planet Finder. Bjork is also “cautiously optimistic” about listening out for aliens with radio telescopes.”

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