An ‘alien meteorite’ probably didn’t slam into Earth — how will we know if one does?
Nature looks at the detective work required to confirm a controversial claim of finding interstellar debris.
A research team made headlines last week when it claimed to have scooped up from the sea floor fragments of a meteorite that came from beyond our Solar System1. Finding such an interstellar sample on Earth would be exciting because it might shed light on how planets and stars beyond our own form. But a number of scientists say that the evidence that the material came from another planetary system is not convincing so far.
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