ESA’s Gaia telescope has mapped a giant wave rippling outward from the Milky Way’s centre, pushing stars tens of thousands of light-years out of place — and scientists still don’t know what set it in motion

Gaia has revealed a vast stellar ripple travelling through the Milky Way's outer disc. Its scale is extraordinary, but its origin remains unknown. The post ESA’s Gaia telescope has mapped a giant wave rippling outward from the Milky Way’s c…

Summary from SpaceDaily.

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1. SpaceDaily 7 Aug
   ESA’s Gaia telescope has mapped a giant wave rippling outward from the Milky Way’s centre, pushing stars tens of thousands of light-years out of place — and scientists still don’t know what set it in motion ↗