The Dinosaur-Killing Meteorite Was Stranger Than Scientists Thought

  • تاريخ النشر: منذ يوم زمن القراءة: دقيقة قراءة

New nickel-isotope evidence points to an unusually rare ancient asteroid from the outer Solar System

It Was Not an Ordinary Space Rock

CO Chondrites Are Exceptionally Rare

It Preserved Material From the Early Solar System

Nickel Supplied the Crucial Fingerprint

The Evidence Survived in a Global Clay Layer

Almost the Entire Asteroid Vanished

It Probably Came From Far Away

It Carried Less Sulphur Than Expected

Earth’s Own Rock May Have Been More Important

The Discovery Makes the Event Even Less Likely

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The object that ended one geological age has never been easy to reconstruct. Almost nothing recognisable survived, leaving scientists to work from chemical traces scattered through rocks worldwide.

A new analysis has narrowed its identity more precisely. The answer does not change what happened, but it makes the visitor—and the chain of events after its arrival—far more unusual.

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