What term describes the stretching of an object into a long strand by a black hole’s tidal forces?
Answer
Spaghettification
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What term describes the stretching of an object into a long strand by a black hole’s tidal forces?
Answer
Spaghettification
For a nonrotating black hole, how far from the singularity is the photon sphere compared with the Schwarzschild radius?
Answer
1.5 times the Schwarzschild radius
What is the name of the region around a rotating black hole where spacetime is dragged along with its spin?
Answer
Ergosphere
What type of black hole is thought to power most active galactic nuclei?
Answer
Supermassive black hole
Which 2015 observatory network made the first direct detection of gravitational waves?
Answer
LIGO
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For a nonrotating black hole, how far from the singularity is the photon sphere compared with the Schwarzschild radius?
Answer
1.5 times the Schwarzschild radius
What type of black hole is thought to power most active galactic nuclei?
Answer
Supermassive black hole
Which mechanism is named for Roger Blandford and Roman Znajek and can extract energy from a spinning black hole?
Answer
Blandford–Znajek process
What is the approximate temperature of a solar-mass black hole from Hawking radiation?
Answer
About 60 nanokelvins
Who coined the modern astronomical use of the term “black hole” in 1967?
Answer
John Archibald Wheeler
How many ventricles are in the human brain?
Answer
Four