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Space

Science

James Baldini

A volcano or a meteorite? New evidence sheds light on puzzling discovery in Greenland's ice sheet

Greenland Earth Iceland Greenland Ice Sheet

A red helicopter hovers over a large ice sheet, kicking up snow with its propellers.

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights.

Buried deep in Greenland's ice sheet lies a puzzling chemical signature that has sparked intense scientific debate. A sharp spike in platinum concentrations, discovered in an ice core (a cylinder of ice drilled out of ice sheets and glaciers) and dated to around 12,800 years ago, has provided support for a hypothesis that the Earth was struck by an exotic meteorite or comet at that time.

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