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What high-energy radiation from infalling matter often helps identify black hole candidates?
Answer
X-rays
Which 1916 solution describes spacetime outside a spherical non-rotating mass?
Answer
Schwarzschild metric
What effect shifts light to longer wavelengths as it escapes a black hole's gravity?
Answer
Gravitational redshift
What spherical zone around a black hole can contain circular photon orbits?
Answer
Photon sphere
The Kerr metric describes an uncharged black hole with what property?
Answer
Rotation
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Which 1916 solution describes spacetime outside a spherical non-rotating mass?
Answer
Schwarzschild metric
What effect shifts light to longer wavelengths as it escapes a black hole's gravity?
Answer
Gravitational redshift
What spherical zone around a black hole can contain circular photon orbits?
Answer
Photon sphere
Which NASA X-ray observatory launched in 1999 studies black holes?
Answer
Chandra X-ray Observatory
What popular term describes extreme stretching by a black hole's tidal forces?
Answer
Spaghettification
What disk of hot matter can form as gas spirals into a black hole?
Answer
Accretion disk
Which German physicist gave his name to the radius of a non-rotating black hole?
Answer
Karl Schwarzschild
At a black hole's event horizon, the escape velocity equals what?
Answer
Speed of light