User blog comment:Spark321939/Are aliens good or will we be advanced enough?/@comment-1197011-20130430012402/@comment-160529-20130430221133

Not cells, life itself. The needs of life are largely the same for it to fall under the definition of life.

A being does not need to be made out of cells, or have DNA. . . or be anything remotely human. . . but I am confident that when we see life, we weill know it. . . because there are things that transcend basic terrestrial biology.