When did the universe reionize itself? The Milky Way's oldest stars may
hold the answer.

By Ken Croswell, author of The Alchemy of the Heavens

The timing of the universe's reionization left its mark on the Milky Way's
stellar halo, say astronomers in Australia and Japan. The sooner this
reionization occurred, the more concentrated our Galaxy's stellar halo
should be.

The astronomers say the stellar halo matches their model in which
reionization occurred at redshift 15. This corresponds to a time 260 million
years after the big bang.

The full story is at http://KenCroswell.com/ChargingUpTheUniverse.html .

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