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SAT, 18.10.2021 20:50 graycelynn123

astronomers have observed a small, massive object at the center of our milky way galaxy. a ring of material orbits this massive object; the ring has a diameter of about 15 light years and an orbital speed of about 200 km/s.

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astronomers have observed a small, massive object at the center of our milky way galaxy. a ring of m...

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