Black Holes

Who first proposed the idea of a body so big that even light could not escape?

• Karl Schwarzschild

• Albert Einstein

• Pierre-Simon Laplace

• John Michell

What is the boundary in spacetime through which matter and light can pass only inward towards the mass of a black hole?

• Ergosphere

• Event Horizon

• Photon Sphere

• Singularity

What is the defining feature of a black hole that makes it impossible for anything, even light, to escape from inside?

• Event Horizon

• Ergosphere

• Singularity

• Photon Sphere

What is the shape of the singular region at the center of a non-rotating black hole?

• Single point

• Ring

• Cube

• Sphere

What is the term used to describe the process where an object falling into a black hole is stretched due to tidal forces?

• Noodlification

• Spaghettification

• Stretchification

• Tidalization

What is the name of the spherical boundary of zero thickness in which photons that move on tangents to that sphere would be trapped in a circular orbit about the black hole?

• Event horizon

• Innermost stable circular orbit

• Photon sphere

• Ergosphere

What region outside of the event horizon of a black hole is characterized by objects not being able to remain in place?

• Gravitational collapse

• Innermost stable circular orbit

• Ergosphere

• Photon sphere

What is the name of the volume bounded by the black hole's event horizon and the ergosurface?

• Gravitational collapse

• Innermost stable circular orbit

• Photon sphere

• Ergosphere

What is the name of the process where objects can emerge from the ergosphere with more energy than they entered with, taking energy from the rotational energy of the black hole?

• Hawking radiation

• Gravitational collapse

• Frame-dragging

• Penrose process

______ is the name of the effect that causes light rays to bend due to the deformation of spacetime around a massive object?