Scientists have found a “highly unusual” particle enriched with uranium in the skies over Alaska’s Aleutian Islands. The source of the substance, which is typically used in nuclear fuel and bombs, is still unclear.
The mysterious substance “containing a very small amount of enriched uranium” was found at an altitude of 7km (4.3 miles) above Alaska’s Aleutian Islands, according to a report issued by the Journal of Environmental Radioactivity.

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