Which of These Observations Was Key to Estimating the Size

question 50

Multiple Choice

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

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