A．About 700 million light－years from Sun.B．About 700 million light－years from Earth.C．

A．About 700 million light-years from Sun.

B．About 700 million light-years from Earth.

C．About 700 million light-years from the black hole.

D．About 700 million light-years from a galaxy.

请帮忙给出正确答案和分析，谢谢！

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