The Gold In Our Galaxy May Be 10 Billion Years Old, Say Scientists

Hundreds of gold-rich stars have been detected inside the Milky Way—and they may be from ancient galaxies.

“The gold-rich stars today tell us the history of the Milky Way,” said Yutaka Hirai from Tohoku University. “These ancient galaxies are the building blocks of the Milky Way. Our findings mean many of the gold-rich stars we see today are the fossil records of the Milky Way's formation over 10 billion years ago.”

It revealed that most of the gold-rich stars formed over 10 billion years ago in small galaxies, which later merged to form the Milky Way. Elements heavier than iron—such as gold and platinum—come from the kind of neutron star mergers that are thought to be common in small galaxies.

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