A long-standing puzzle regarding the nature of disk galaxies has finally been solved by a team of astronomers using state-of-the-art theoretical models. The new study shows that groups of stars with the same age always flare as the result of massive galactic collisions. When taken all together, these flares, nested like the petals of a blooming rose, puff up the disk and constitute what astronomers call the “thick” disk.
via Science Daily
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