When searching for extraterrestrial intelligence, being certain can be tricky business.
that his team had recovered unusual magnetic material consisting of an alloy of iron, titanium and magnesium that “does not resemble known human-made alloys or familiar asteroids.” He asked whether the asteroid might have been manufactured by some alien technology.
And while comparing a possible sign of life to more mundane alternatives, it’s also important to acquire that most essential form of comparison in science—a control sample. Since it landed on Mars in 2021, for example, NASA’s rover has been collecting tubes of rock and soil that will be returned to Earth for analysis in the early 2030s.
For his part, Loeb says his team believes the spheres they found are in fact from the meteor, and not other sources. “The composition of the spherules along the meteor path is different from that of volcanic ash,” he writes in an email to. “Our control samples were obtained tens of kilometers away from the meteor path, and revealed an abundance of spherules lower by a factor of 10 from the meteor path.
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