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Sterilizing Mars spacecraft is largely a waste of money, two experts argue

Date:
June 27, 2013
Source:
Washington State University
Summary:
Two university researchers say environmental restrictions have become unnecessarily restrictive and expensive -- on Mars.
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Two university researchers say environmental restrictions have become unnecessarily restrictive and expensive -- on Mars.

Writing in the journal Nature Geoscience, astrobiologists Alberto Fairén of Cornell University and Dirk Schulze-Makuch of Washington State University say the NASA Office of Planetary Protection's "detailed and expensive" efforts to keep Earth microorganisms off Mars are making missions to search for life on the red planet "unviable."

The researchers claim "the protocols and policies of planetary protection are unnecessarily restricting Mars exploration and need to be revised."

The Office of Planetary Protection is like an interplanetary Environmental Protection Agency, with a mission "to minimize the biological contamination that may result from exploring the solar system."

As far as Mars is concerned, say Fairén and Schulze-Makuch, such efforts are probably in vain since "Earth life has most likely already been transferred to Mars." Meteorite impacts have had 3.8 billion years to spread Earth life forms to Mars. Several Earth spacecraft have visited Mars without undergoing the sterilization procedures now in place.

If organisms transferred to Mars over the eons failed to survive, modern organisms would likely face the same fate. If they did survive, say Fairén and Schulze-Makuch, "it is too late to protect Mars from terrestrial life, and we can safely relax the planetary protection policies."

The researchers say spacecraft looking for life on Mars should still be cleaned to some extent to avoid confusing possible Martian organisms with organisms brought from Earth. But sterilization for other missions, like orbiters and geology-oriented explorers, could be scaled back.

"As planetary exploration faces drastic budget cuts globally," they say, "it is critical to avoid unnecessary expenses and reroute the limited taxpayers' money to missions that can have the greatest impact on planetary exploration."


Story Source:

The above story is based on materials provided by Washington State University. The original article was written by Eric Sorensen. Note: Materials may be edited for content and length.


Journal Reference:

  1. Alberto G. Fairén, Dirk Schulze-Makuch. The overprotection of Mars. Nature Geoscience, 2013; 6 (7): 510 DOI: 10.1038/ngeo1866

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Washington State University. "Sterilizing Mars spacecraft is largely a waste of money, two experts argue." ScienceDaily. ScienceDaily, 27 June 2013. <www.sciencedaily.com/releases/2013/06/130627102617.htm>.
Washington State University. (2013, June 27). Sterilizing Mars spacecraft is largely a waste of money, two experts argue. ScienceDaily. Retrieved May 25, 2015 from www.sciencedaily.com/releases/2013/06/130627102617.htm
Washington State University. "Sterilizing Mars spacecraft is largely a waste of money, two experts argue." ScienceDaily. www.sciencedaily.com/releases/2013/06/130627102617.htm (accessed May 25, 2015).

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