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#11
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Bacteria in spaeships
What are we going to do about preventing Earth bacteria
from contamenating Mars biota when we set foot on Mars? A microbiologist discovered that Acetinobacter can eat the desinfectant that NASA sprays in their clean rooms... A soil bacteria. Now, NASA is selecting the hardest microbes to send to space... All other normal microbes are dead, and Actetinobacter has no competition. Arrived to destination (say Mars) Acetinobacter could be devasting for a local biota. Since it is extremely resistant, it could spread unchecked. Is it a good idea to desinfect spaceships? Or it would be better to have as much as possible of weak, normal bacteria that are surely dead if confronted to space? Or coat the spaceships with very fragile bacteria that would prevent Acetinobacter to thrive and would be immediately dead in space? What is important is that in space no earth bacteria survive unchecked. |
#12
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Bacteria in spaeships
Le 26/06/2018 à 03:04, Jeff Findley a écrit*:
I call bull****. You're the one who used the word "thrive". These are*not* examples o bacteria thriving under something close to Mars conditions. These are examples of them surviving exposure to vacuum, but they weren't growing, weren't reproducing, and etc. They were essentially dormant. Yes. I was answering to you saying: quote Not near vacuum. Try again. end quote OK, now that THAT objection is cleared you change the subject and admit that bacteria can survive total vacuum. They can also survive an hypervelocity impact, so even if the spacecraft crashes and all humans are dead, their bacteria could survive. But I see that with scientific arguments (published papers, etc) you get nowhere in a newsgroup where anybody can say anything and when proved wrong they just change the subject... Plants have been grown using simulated marsian soil, not under vacuum conditions but that proves that nutrients are present... Bacteria are far more resistant than plants, and could develop after a probably long adaptation period. |
#13
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Bacteria in spaeships
Le 26/06/2018 Ã* 07:26, William Elliot a écritÂ*:
What are we going to do about preventing Earth bacteria from contamenating Mars biota when we set foot on Mars? There is NO WAY to desinfect a human. A human body is a full ecosystem with fungi, bacteria, viruses, and many organisms that live in it using the rests of skin, and secretions to feed themselves. This means that if we send humans we contaminate the planet where we send them. That is why I am against any Mars colonization until it is 100% sure that no organisms live there. Much worst is the fact that humans RETURN to earth, contrary to machines that stay there. If any marsian bugs exist, they could hitch a ride from Mars to Earth with uncalculable consequences. Contamination, of course, goes both ways! |
#14
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Bacteria in spaeships
William Elliot wrote on Mon, 25 Jun 2018 22:26:12
-0700: What are we going to do about preventing Earth bacteria from contamenating Mars biota when we set foot on Mars? What 'Mars biota'? Do you seriously believe that bacteria evolved for Earth conditions are going to out-compete stuff that evolved for the conditions that exist on Mars? -- "Some people get lost in thought because it's such unfamiliar territory." --G. Behn |
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#17
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Bacteria in spaeships
Le 26/06/2018 à 13:22, Jeff Findley a écrit*:
OK, now that THAT objection is cleared you change the subject and admit that bacteria can survive total vacuum. Survive in a completely dormant state. Unless something close to earth normal atmosphere, humidity, and etc. is eventually restored, all of those examples will not survive in the long term. They will die out. So, what's the problem with letting a few of them escape on the surface of Mars where the ratified atmosphere and solar radiation will eventually kill them? They have to get a few cm underground and there the radiation is far less. If they sink to depths of 1 meter they are shielded from radiation. As Mars exploration advances, we find water under the surface in great quantities: full frozen lakes are just under a few meters of soil. In the poles of Mars, NASA retrieved water by just drilling a few cm of soil. Underground, the bacteria would find a very hospitable environment, with water, no radiation, and probably a lot of nutrients to go by. They can also survive an hypervelocity impact, so even if the spacecraft crashes and all humans are dead, their bacteria could survive. Yes, only to eventually die due to lack of atmospheric pressure. They have to just get underground and they are OK. |
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#19
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Bacteria in spaeships
On Tue, 26 Jun 2018, Jeff Findley wrote:
What are we going to do about preventing Earth bacteria from contamenating Mars biota when we set foot on Mars? You're assuming that there is an actual living Mars biota. This has not been proven. There are signs that Mars may have had life in the distant past, but we do not have any definitive evidence that proves life exists on Mars today. Isn't my assumption. It's NASA's. |
#20
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Bacteria in spaeships
William Elliot wrote on Tue, 26 Jun 2018 21:44:42
-0700: On Tue, 26 Jun 2018, Jeff Findley wrote: What are we going to do about preventing Earth bacteria from contamenating Mars biota when we set foot on Mars? You're assuming that there is an actual living Mars biota. This has not been proven. There are signs that Mars may have had life in the distant past, but we do not have any definitive evidence that proves life exists on Mars today. Isn't my assumption. It's NASA's. Please cite this NASA assumption that there is an actual living Mars biota. Note that spacecraft sterilization efforts do not demonstrate such an assumption, since we did the same thing for lunar probes and nobody thought there was an actual living biota there. -- "Some people get lost in thought because it's such unfamiliar territory." --G. Behn |
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