![](https://webarchive.library.unt.edu/eot2008/20090305074003im_/http://astrobiology.nasa.gov/img/_placehold/placehold-ask.jpg)
![Ask an Astrobiologist](https://webarchive.library.unt.edu/eot2008/20090305074003im_/http://astrobiology.nasa.gov/img/text/ask-an-astrobiologist.gif)
"What type of scientific proof is there that Earth is the only location in the universe that life has ever existed on?"
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Mars Pathfinder
External Link: Mars Pathfinder Science Results Directory
January 18, 2008
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External Link: Mars Pathfinder Science Results Directory