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Evidence
This shows ten years worth of Prof. Ghez’ data at 2.2 microns of the stars orbiting around a 4 million solar mass black hole at the center of the Milky Way.
It also shows the star’s orbits extrapolated into the future
Notes:
This is a more detailed version of the previous slide’s data, showing where the stars will orbit into the future near the center of our Milky Way galaxy. You saw a fancier version of this during the planetarium show.