User blog comment:ProfessorMcG/Time Travel. Is it possible?/@comment-2067355-20100814232941

Not quite EE, for a planet to have life it requires several things; 1) A stable orbit within the habitable zone; 2) A strong magnetic field to keep out deadly cosmic rays; 3) A liquid medium for which life forms to develop in, and; 4) The correct elements for life, such as Carbon, Oxygen, and Phosphorus.