The author states the great filter could be composed of multiple filters towards the end of the paper. > Nothing in the above reasoning precludes the Great Fil

The author states the great filter could be composed of multiple filters towards the end of the paper. > Nothing in the above reasoning precludes the Great Filter from being located both behind us and ahead of us. It might both be extremely improbable that intelligent life should arise on any given planet, and very improbable that intelligent life, once evolved, should succeed in becoming advanced enough to colonize space.