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How missions to Mars can contaminate red planet – Burning Issues – Free PDF



  • Astrobiologists say that if there is a chance that Mars has life, even in its most primitive form, there is an ethical obligation on humanity to ensure that microbes from Earth do not disturb a possible Martian biosphere


  • Last week witnessed the launch of two missions to Mars – China’s Tianwen-1 on Thursday, which aims to land on the Red Planet’s surface, and the UAE’s Al Amal (Hope)on Monday, which does not involve a landing, but an orbital mission that will study the Martian atmosphere.
  • On July 30, the US will launch its Perseverance mission, which, if all goes well, would be NASA’s 10th successful Mars landing since 1975.


  • In the past, space missions have established physical contact with astronomical bodies such as comets and asteroids, and crewed missions have landed on the Moon.
  • In the case of Mars, however, space missions have already discovered the possible presence of liquid water on the planet, either in the subsurface today or at some point in its past, and are now actively looking for signs of life.


  • The United Nations Outer Space Treaty of 1967, which serves as a bulwark against the militarisation of space, also requires nations to worry about contamination risks. Its 110 state parties include the US, Russia, China, and India.
  • To ensure compliance with the Treaty, the Committee on Space Research (COSPAR) lays down a ‘planetary protection policy’ that aims to limit the number of microbes sent to other planets, as well as ensuring that alien life does not cause havoc on Earth.


  • NASA also plans for a Mars sample-return mission, which would bring samples of the Red Planet back to Earth, possibly by 2031.
  • Scientists, however, all but rule out back contamination. The suggestion that Martian microbes (if they exist) would infect human beings–causing a catastrophe like the current pandemic– is highly unlikely, given the fact that their biochemistry would be markedly different from that on Earth.


  • According to NASA, the guidelines have had far-reaching implications on human spacecraft design, operational procedures, and overall mission structure. Both NASA and the ESA have also appointed Planetary Protection Officers.
  • To prevent forward contamination, space missions take care to ensure that spacecraft are sterilised.  Last week, NASA’s Perseverance mission was postponed for a second time to resolve a potential contamination issue.



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