Red giants map how the Milky Way grew | Science News

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Red giants map how the Milky Way grew

Measuring the mass of 70,000 aging stars reveals older center, younger outskirts

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1:30pm, January 12, 2016
red giant

AGE MAP  The ages of tens of thousands of red giant stars are charted atop a map of the Milky Way. The oldest stars are in red, near the galactic center. The youngest stars are blue.

KISSIMMEE, Fla. — Our galaxy was built from the inside out. That’s the clear conclusion from an unprecedented survey of the ages of tens of thousands of the galaxy’s stars, reported January 8 at a meeting of the American Astronomical Society. “The Milky Way grew up by growing out,” Melissa Ness, an astronomer at the Max Planck Institute for Astronomy in Heidelberg, Germany, said at a news conference.

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