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Which of the following statements is not true of the object known as Sgr A* in the center of our Galaxy?a. It is a source of X-ray emission that we have observed with telescopes in space.b. It is thought to harbor a black hole of about 4 million solar masses.c. It is a source of bright radio emission.d. It is by far the brightest source of visible light lying in the direction of the galactic center.

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