If the Galactic Center of the Milky Way Is Now

question 312

Multiple Choice

If the galactic center of the Milky Way is now thought to contain a supermassive black hole,why is the Sun not falling into it under the black hole's extreme gravity?

• A) The Sun's mass is so small that even the extreme mass concentration at the galactic center will not exert a significant force on it.
• B) The inward force exerted on the Sun from the black hole is offset by the force exerted outward by the hidden "dark" matter beyond the Sun's orbit.
• C) The mutual gravitational forces of local stars in the Orion spiral arm are sufficient to overcome the strong inward force and keep the Sun moving in its orbit.
• D) The Sun has sufficient velocity that it can orbit the galactic center in a circle.

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