What boundary around a black hole is the point of no return for light and matter?
Answer
Event horizon
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What boundary around a black hole is the point of no return for light and matter?
Answer
Event horizon
Which astronomer shared the 2020 Nobel Prize for discovering the compact object at the Milky Way's center with Reinhard Genzel?
Answer
Andrea Ghez
In the no-hair theorem, black holes are described by mass, electric charge, and what third quantity?
Answer
Angular momentum
Which mathematician discovered the Kerr metric for rotating black holes in 1963?
Answer
Roy Kerr
Which vacuum state models Hawking radiation with no particles incoming from past infinity?
Answer
Unruh state
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Which 1939 model describes collapse of a uniform dust sphere into a black hole?
Answer
Oppenheimer-Snyder model
On what date was the GW150914 black-hole merger signal detected?
Answer
September 14, 2015
What event occurs when a star is torn apart by a black hole's tidal forces?
Answer
Tidal disruption event