![]() Something to decrease the speed of the Sun around its orbit.More "pulling" mass, but there is no reason this mass suddenly appears.To change the Sun's trajectory and make the Sun "fall", what you would need would be: If would not change anything on the Sun trajectory. What would happen if instead of this super massive black hole there would be many stars, totalizing the mass of the black hole? Nothing. So for the effect of the black hole to become dominant, you would need to be very close from it. The mass inside the radius of the Sun is way lower (you could calculate it from the speed of the Sun and its distance from the center), but still, the mass of the black hole is very small compared to the rest of the mass inside the Sun's radius. The total mass of the Galaxy is about 10^12 (a thousand billion) solar masses ( ). The mass of the black hole at the center of our galaxy is about 10^6 (1 million) solar masses (from this paper: ). Now, the question is: considering that the black hole at the center of our galaxy is super massive, does it plays an important role for stars like the Sun, at our distance? To answer this, you simply have to ask yourself if the mass of the black hole is important or negligible in front of the mass of the other components that are inside the orbit of our Sun. And if the sun would instantly change into a black hole (of equal mass), the Earth trajectory would not change at all (but yes, you would have to turn on the heater!). A black hole of 50 solar masses has no more "gravitational power" than a star of 50 solar masses. Actually, they simply have the gravitational force of their mass. It is often believed that black holes have a huge gravitational force. There is just a super massive black hole. There is no "super massive black hole which holds the galaxy together". There is an incorrect assumption in this question.
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