Looking at the vastness of the universe and its countless possible solar systems, it seems quite likely that life has arisen at some point in its history on some of the countless planets that have formed in countless solar systems.
Ef horft er á alheiminn í heild sinni verður einnig að þykja tölfræðilega líklegt að líf hafi kviknað á einhverri annarri plánetu, einhversstaðar í alheiminum, einhvern tímann í sögu hans.