alien encounters years a russian astronomer say expects humans encounter extraterrestrial civilisations scientists expect humanity encounter alien civilisations decades russian astronomer said mondaythe genesis life inevitable formation atoms life exists planets 20 years said andrei finkelstein director russian academy sciences applied astronomy institute according interfax news international forum dedicated search extraterrestrial life finkelstein said 10 known planets circling suns galaxy resemble earthif water life said adding aliens likely resemble humans arms legs headthey different colour skin institute runs programme launched 1960s height cold space race watch beam radio signals outer spacethe time searching extraterrestrial civilisations mainly waiting messages space way saidin march a nasa scientist caused controversy claiming tiny fossils alien bugs inside meteorites landed earthrichard hoover astrobiologist space agencys marshall space flight centre alabama said filaments structures rare meteorites appear microscopic fossils extraterrestrial beings resemble algae known journal cosmology hoover claimed lack nitrogen samples essential life earth indicated remains extraterrestrial life forms grew parent bodies meteorites liquid water present long meteorites entered earths atmospherealien life