If life has arisen only once on any -- life could originate once per planet, could be extremely common or it could originate once per star or once per galaxy or maybe only once in the entire universe, in which case it would have to be here.
Jos elämä on kehittynyt vain kerran -- elämää voisi kehittyä kerran per planeetta, siis usein, tai kerran per tähti, tai kerran per galaksi tai kenties kerran per koko universumi, mikä siis olisimme me.