The Daily Telegraph (Sydney) - - News -

AS­TRONOMERS have been left scratch­ing their heads at the dis­cov­ery that ev­ery gal­axy, no mat­ter how big or small, ro­tates once ev­ery bil­lion years.

The WA re­search also found ev­i­dence of older stars ex­ist­ing at the edge of galax­ies, where only newly formed stars and gas were pre­vi­ously ex­pected to ap­pear.

In­stead, they dis­cov­ered a sig­nif­i­cant pop­u­la­tion of much older stars min­gling with the young stars and gas on the out­skirts of galax­ies.

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