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The galactic core is the center (not the very center) of the Milky Way Galaxy.
One galactic rotation at our distance from the galactic center takes about 220 million years.
A galactic centre.A galactic centre.A galactic centre.A galactic centre.
The galactic center.
The galactic center is somewhere in the neighbourhood of 24 - 26000 light years (around 7600 parsecs)