Interplanetary contamination | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-10

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Interplanetary_contamination


00:02:07 1 Overview
00:06:00 2 Evidence for possible habitats outside Earth
00:06:23 2.1 Mars
00:09:29 2.2 Enceladus
00:10:30 2.3 Europa
00:11:42 3 Planetary protection
00:13:30 4 Crewed spacecraft
00:14:52 5 The Moon as a testbed
00:15:34 6 Non-contaminating exploration methods
00:16:14 7 Back contamination issues
00:18:31 7.1 Suggested precautions for sample-returns
00:19:16 7.1.1 Chain of contact
00:19:59 7.1.2 Receiving facility
00:23:44 7.1.3 Dissenting views on back contamination
00:24:11 7.1.4 Legal process of approval for Mars sample-return
00:26:18 7.2 Alternatives to sample-returns
00:28:54 7.2.1 Instruments under development for iin situ/i analyses
00:30:09 7.2.2 Study and analyses from orbit



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SUMMARY
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Interplanetary contamination refers to biological contamination of a planetary body by a space probe or spacecraft, either deliberate or unintentional.
There are two types of interplanetary contamination:

Forward contamination is the transfer of life and other forms of contamination from Earth to another celestial body.
Back contamination is the introduction of extraterrestrial organisms and other forms of contamination into Earth's biosphere. It also covers infection of humans and human habitats in space and on other celestial bodies by extraterrestrial organisms, if such habitats exist.The main focus is on microbial life and on potentially invasive species. Non-biological forms of contamination have also been considered, including contamination of sensitive deposits (such as lunar polar ice deposits) of scientific interest. In the case of back contamination, multicellular life is thought unlikely but has not been ruled out. In the case of forward contamination, contamination by multicellular life (e.g. lichens) is unlikely to occur for robotic missions, but it becomes a consideration in crewed missions to Mars.Current space missions are governed by the Outer Space Treaty and the COSPAR guidelines for planetary protection. Forward contamination is prevented primarily by sterilizing the spacecraft. In the case of sample-return missions (back contamination) the aim of the mission is to return extraterrestrial samples to Earth, and sterilization of the samples would make them of much less interest. So, back contamination would be prevented mainly by containment, and breaking the chain of contact between the planet of origin and Earth. It would also require quarantine procedures for the materials and for anyone who comes into contact with them.