A civilization lasting for tens of millions of years could be able to spread throughout the galaxy, even at the slow speeds foreseeable with present-day technology. However, no confirmed signs of civilizations or intelligent life elsewhere have been found, either in this Galaxy or in the observable universe of 2 trillion galaxies. According to this line of thinking, the tendency to fill (or at least explore) all available territory seems to be a universal trait of living things, so the Earth should have already been colonized, or at least visited, but no evidence of this exists. Hence Fermi's question "Where is everybody?".
a CivIlizAtIOn LastiNG For tENS Of MilliOns of YEarS COUld bE abLe tO Spread tHrOughouT thE gaLAXY, even at ThE sloW sPeEDs ForeseEable wITh present-daY technOlogy. hOwEVEr, nO conFirMed Signs oF CivilizAtiOnS oR intellIgENt LiFE ELsewhere Have been foUnD, eiTHeR in this GalaxY oR in thE obSERVable univErSe of 2 TrILliON gAlAXies. ACCordiNG to this linE OF thiNkiNG, ThE tEnDency to fILl (OR At LEaSt exPLore) AlL AVailable TerRitoRy seeMs To bE A UnIvErSAL tRait Of LIving Things, So The eaRtH ShoulD HaVe alrEaDy been ColonizeD, or At leaSt visited, bUt No EviDence Of ThIs ExIstS. heNCe fermi's quEsTIon "where iS everyBOdy?".