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Review of the U.

Assessment of the U. Spara som favorit. These rovers likely have an extremely low number of microbial stowaways. Any terrestrial biota that do manage to hitch rides on the outside of those rovers would have a very hard time surviving the half-year journey from Earth to Mars.

Spacecraft Water Exposure Guidelines for Selected Contaminants: Volume 2 (2006)

The vacuum of space combined with exposure to harsh X-rays, ultraviolet light and cosmic rays would almost certainly sterilize the outsides of any spacecraft sent to Mars. Any bacteria that sneaked rides inside one of the rovers might arrive at Mars alive. But if any escaped, the thin Martian atmosphere would offer virtually no protection from high energy, sterilizing radiation from space. Those bacteria would likely be killed immediately.

Since no rovers have explored caves or dug deep holes, we have not yet had the opportunity to come face-to-drill-bit with any possible Martian microbes.

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Given that the exploration of Mars has so far been limited to unmanned vehicles, the planet likely remains free from terrestrial contamination. None of these materials can be sterilized in the same ways systems associated with robotic spacecraft can. Human colonists will produce waste, try to grow food and use machines to extract water from the ground and atmosphere. Simply by living on Mars, human colonists will contaminate Mars. Space researchers have developed a careful approach to robotic exploration of Mars and a hands-off attitude toward Europa and Enceladus.

Why, then, are we collectively willing to overlook the risk to Martian life of human exploration and colonization of the red planet? What we discover could influence our collective decision whether to send colonists there at all.

What risks might Martian life pose to our environment or our health? And does any one country or group have the right to risk back contamination if those Martian lifeforms could attack the DNA molecule and thereby put all of life on Earth at risk?

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And these missions will contaminate Mars. Some scientists believe they have already uncovered strong evidence for life on Mars , both past and present. If life already exists on Mars, then Mars, for now at least, belongs to the Martians. Mars is their planet, and Martian life would be threatened by a human presence there. Does humanity have an inalienable right to colonize Mars simply because we will soon be able to do so?

Where life could be

We have the technology to use robots to determine whether Mars is inhabited. View Cover. Login or Register. E-mail this page Embed book widget. What is an eBook? Why is an eBook better than a PDF? Where do I get eBook files?

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Appendix 3 Barium and Barium Salts. Appendix 5 Cadmium Inorganic Salts. Appendix 6 Caprolactam.

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