What feature of the black hole was crucial to Ghez’s discovery?
Accretion disk
Quasar activity
Event Horizon
Hawking radiation
Answer
The event horizon of a black hole, the point of no return beyond which nothing, not even light, can escape, played a pivotal role in Andrea Ghez's groundbreaking discovery. By meticulously monitoring the motion of stars orbiting the supermassive black hole at the center of our galaxy, Sagittarius A*, she was able to infer its presence and measure its mass.
Stargazing Brilliance: The Andrea M. Ghez Astronomy Challenge
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