One problem with the recent biological
deposit on our moon is there is a general consensus that we don't
want to alter any alien ecosystems, especially in delicate
environments that might be vulnerable to invasive life. Another
problem is that scientists don't want to encounter false-positives,
thinking that they've discovered extraterrestrial life only to
realize that the life originated on Earth. Since the beginning of
space travel, we have had strongly scrutinized protocols regarding
planetary protection. However, it is inevitable that human
exploration will inadvertantly introduce micro-organisms from Earth
to other worlds. In fact, it is very likely that this has already
happened, even before humans occupied Earth...
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