[academi]

> Artificial material seems to be present in chamber C

What good is this if they’re guessing at it being a contaminant they introduced?

At least say it’s possible that it isn’t. Maybe it really had metal fragments on it.

[icebadger]

This is the rest of the paragraph:

> Artificial material seems to be present in chamber C. The origin is under investigation, but a probable source is aluminium scraped off the spacecraft sampler horn as the projectile was fired to stir up material during touchdown.

[op00to]

Because it is most likely a piece of the spacecraft that got broken off during the collection attempt.