My guess is just about any that was to get onto the lander would be killed almost immediately upon re-entry. We're not talking simple cooking temperatures here, reentry temps for a spacecraft are usually on the order of 3000 F or 1650 C, this is much hotter than you can get any substance in a simple oven, and is hot enough to boil all of the water out of a small substance like bacteria in seconds, all life forms we know of needing water to survive, this should be fatal to just about anything living.
According to this article, the highest known temperature that nay organism currently known can survive is about 266 F , that puts the temperature in the spacecraft at about 6 times the absolute temperature that the highest known organism can survive.
http://edition.cnn.com/2003/TECH/science/08/15/cha mpion.of.heat.ap/
With probes, any area where the bacteria could possibly get in would have to be open to air, and with or without a heat shield, should easily get hot enough to destroy any bacteria. The only possibility for bacteria to survive would then be to get in on a manned mission onto the astronauts suits or into the cabin. First off, any astronauts will have at least a 10 month journey on the way back where if the bacteria were to have any negative effects, it would likely be noticed there and precautions could be taken. Furthermore, any spacecraft that large could easily have facilities built in to clean the air of bacteria over the long term using air purifying mechanisms etc.
Furthermore, the climate on Mars being much colder than that on earth on average, I would find it highly unlikely that any bacteria could thrive on the earth at our normal temperatures, much less the extremes of spaceflight.
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My guess is just about any that was to get onto the lander would be killed almost immediately upon re-entry. We're not talking simple cooking temperatures here, reentry temps for a spacecraft are usually on the order of 3000 F or 1650 C, this is much hotter than you can get any substance in a simple oven, and is hot enough to boil all of the water out of a small substance like bacteria in seconds, all life forms we know of needing water to survive, this should be fatal to just about anything living. According to this article, the highest known temperature that nay organism currently known can survive is about 266 F , that puts the temperature in the spacecraft at about 6 times the absolute temperature that the highest known organism can survive. http://edition.cnn.com/2003/TECH/science/08/15/cha mpion.of.heat.ap/
With probes, any area where the bacteria could possibly get in would have to be open to air, and with or without a heat shield, should easily get hot enough to destroy any bacteria. The only possibility for bacteria to survive would then be to get in on a manned mission onto the astronauts suits or into the cabin. First off, any astronauts will have at least a 10 month journey on the way back where if the bacteria were to have any negative effects, it would likely be noticed there and precautions could be taken. Furthermore, any spacecraft that large could easily have facilities built in to clean the air of bacteria over the long term using air purifying mechanisms etc.
Furthermore, the climate on Mars being much colder than that on earth on average, I would find it highly unlikely that any bacteria could thrive on the earth at our normal temperatures, much less the extremes of spaceflight.