Ancient dwarf galaxy was heavy-element factory

Cataclysm in Reticulum II identified as site of ‘r-process’

Dwarf galaxy Reticulum II

HEAVY METALS  Scientists observed nine stars (circled) in the dwarf galaxy Reticulum II. Their data (shown for three stars) indicated the presence of heavy elements, formed through a sequence of reactions known as the “r-process.”

A. Ji, Fermilab/Dark Energy Survey (background image)

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