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So, they dragged a magnet across the bottom of the ocean and found signs of non-naturally occurring materials… why is the first reaction that it is anything other than more human waste?

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"We found a composition of mostly iron with some magnesium and titanium but no nickel. This composition is anomalous compared to human-made alloys, known asteroids and familiar astrophysical sources."

I took that to mean it wasn't likely to be human-made. Is that a misinterpretation?

If people drag stuff up in other locations and come up with the same stuff then it would be naturally occurring but we just haven't seen it before.

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