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Milky Way has corrugated rings

The Milky Way's stars sprawl outwards in a series of concentric ripples, hinting that it might extend farther into space than was thought.

Data from the Sloan Digital Sky Survey confirm a previously known ring of stars at about 9,000 parsecs from the Sun. They also show another ring about 14,000 parsecs from the Sun, says a team led by Yan Xu of the National Astronomical Observatories of China in Beijing. These rings each form a ripple, making our Galaxy corrugated rather than flat.

The ripples may have formed when a dwarf galaxy passed through the Milky Way, creating rings of stars with its gravitational pull.

Astrophys. J. 801, 105 (2015)

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Milky Way has corrugated rings. Nature 519, 265 (2015).

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