Changes

[[Image:Mars_meteorite.jpg|thumb|250px|[[Meteorite]] believed to have once been a part of [[Mars]] and to contain [[fossil]] evidence that primitive [[life]] may have existed on Mars.[http://spaceflight.nasa.gov/gallery/images/mars/meteorites/html/s94_032549.html] ]]

[[Image:Mars_meteorite.jpg|thumb|250px|[[Meteorite]] believed to have once been a part of [[Mars]] and to contain [[fossil]] evidence that primitive [[life]] may have existed on Mars.[http://spaceflight.nasa.gov/gallery/images/mars/meteorites/html/s94_032549.html] ]]

[[Panspermia]] is a theory that originated in the 19th century in opposition to the theory of [[spontaneous generation]]. Pansperia propounded that reproductive bodies of living organisms exist throughout the universe and develop wherever the environment is favorable. The basic tenet of panspermia is that primitive life, which originated someplace else, was deposited on Earth’s surface by means of a collision with some other object that already harbored life.  

[[Panspermia]] is a theory that originated in the 19th century in opposition to the theory of [[spontaneous generation]]. Panspermia propounded that reproductive bodies of living organisms exist throughout the universe and develop wherever the environment is favorable. The basic tenet of panspermia is that primitive life, which originated someplace else, was deposited on Earth’s surface by means of a collision with some other object that already harbored life.  

This theory has been repopularized upon the realization of the improbability that life formed through [[abiogenesis]] on earth, and is now more commonly called [[exogenesis]].

This theory has been repopularized upon the realization of the improbability that life formed through [[abiogenesis]] on earth, and is now more commonly called [[exogenesis]].