Which of these observations was key to estimating the size of Sagittarius A*?
A) an X-ray flare that faded over a few hours
B) synchrotron radiation from the surrounding magnetic fields
C) the Doppler shifts of stars orbiting the black hole
D) the rate gas falls onto the black hole

Question

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The Answer of Which of these observations was key to estimating the size of Sagittarius A*?
A) an X-ray flare that faded over a few hours
B) synchrotron radiation from the surrounding magnetic fields
C) the Doppler shifts of stars orbiting the black hole
D) the rate gas falls onto the black hole

Which of These Observations Was Key to Estimating the Size