Webb Just Found a 12.5-Billion-Year-Old Fossil of Our Galaxy

Terzan 5 isn't a star cluster — it's a leftover building block of the Milky Way's core

Its oldest stars formed 12.5 billion years ago, near the dawn of the universe

It holds four separate generations of stars: 12.5, 4.7, 3.8 and 2.5 billion years old

Webb's infrared eyes saw through thick dust that blocked telescopes for decades

Only two such 'bulge fossil fragments' are known — Terzan 5 and Liller 1

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