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.
Rights and permissions
About this article
Cite this article
Milky Way has corrugated rings. Nature 519, 265 (2015). https://doi.org/10.1038/519265c
Published:
Issue Date:
DOI: https://doi.org/10.1038/519265c