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Since the Apollo Program, there has been at least one independent investigation into the validity of the NASA claim. Leonard D. Jaffe, a Surveyor program scientist and custodian of the Surveyor 3 parts brought back from the Moon, stated in a letter to the Planetary Society that a member of his staff reported that a "breach of sterile procedure" took place at just the right time to produce a false positive result. One of the implements being used to scrape samples off the Surveyor parts was laid down on a non-sterile laboratory bench, and then was used to collect surface samples for culturing. Jaffe wrote, "It is, therefore, quite possible that the microorganisms were transferred to the camera after its return to Earth, and that they had never been to the Moon."
The Surveyor 3 camera was returned from the Moon in a nylon duffel bag, and was not in the type of sealed airtight metal container used to return lunar samples in the early Apollo missions. It is therefore possible that it was contaminated by the astronauts and the environment in the Apollo 12 capsule itself.
So far, earth life 1, pan spermia and other solar system bodies, "0"
Counterveiling evidence against the secondary contamination hypothesis is the fact that, according to Lieutenant Colonel Fred Mitchell, lead author of the original 1971 paper there was a significant delay before the sampled culture began growing: this is consistent with the sampled bacteria consisting of dormant spores, but not if the sampled culture was the result of fresh contamination. In addition, according to Mitchell, the microbes clung exclusively to the foam during culturing, which would not have happened had there been contamination. Furthermore, if fresh contamination had occurred, millions of individual bacteria and "a representation of the entire microbial population would be expected"; instead, only a few individual bacteria were sampled, and only from a single species.
reply to post by wildespace
Additionally to what you say, it was also possible the astronauts contaminated the camera in the return trip
Means you miss the point of the op…