(do que se pensava):
http://www.ibtimes.co.uk/are-stars-surrounding-milky-way-alien-space-invaders-were-they-booted-out-galaxy-1664011
Citando:
""The oscillations can be compared to sound waves in a musical instrument," the lead author of the new research, Maria Bergemann of the Max Planck Institute for Astronomy (MPIA), said. "We call this 'ringing' in the Milky Way galaxy 'galactoseismology,' which has been predicted theoretically decades ago. We now have the clearest evidence for these oscillations in our galaxy's disk obtained so far!"
The scientists studied 14 stars in two different halo structures, located on opposite ends of the Milky Way disk. The two structures, called the Triangulum-Andromeda (Tri-And) and the A13 stellar overdensities, are about 14,000 light-years above and below the galactic plane. The researchers were able to present the chemical abundance patterns of these halo stars for the first time, using the W M Keck Observatory in Hawaii."
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