These geometric lines grew inside an asteroid.

In some iron meteorites, metal crystals formed as the interior cooled over millions of years. Cutting, polishing and etching the metal reveals the pattern.

A slice of space, carrying a record of slow cooling.

A meteorite carries a pattern millions of years old

Interlocking crystal bands in the etched surface of a Canyon Diablo iron meteorite

Interlocking crystal bands in the etched surface of a Canyon Diablo iron meteorite — Natural History Museum, London

A cut and etched iron meteorite specimen revealing its crystalline interior

A cut and etched iron meteorite specimen revealing its crystalline interior — Natural History Museum, London

A separate Henbury iron meteorite showing its dark outer fusion crust

A meteorite carries a pattern millions of years old

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