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Physics, 13.11.2019 01:31 dnarioproctor

To calculate the dashed orbits from the stellar positions, astronomers had to assume that a) if they observed for many more years, the dots would trace out parabolas b) if they observed for many more years, the dots would trace out ellipses c) the central object has a mass of about 4 million solar masses d) the stars are all main-sequence stars.

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