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Event horizon: Quiz


Question 1: Examples of cosmological models without an event horizon are universes dominated by ________ or by radiation.

Question 2: The most commonly known example of an event horizon is defined around general relativity's description of a ________, a celestial object so dense that no matter or radiation can escape its gravitational field.
Kerr metricBlack holeKerr–Newman metricSchwarzschild metric

Question 3: For the mass of the Sun this radius is approximately 3 kilometers, and for the ________ it is about 9 millimeters.

Question 4: One such candidate theory is ________.
Superstring theoryD-braneM-theoryString theory

Question 5: An example of a cosmological model with an event horizon is a universe dominated by the ________ (a de Sitter universe).
Big BangDark energyInflation (cosmology)Cosmological constant

Question 6: How the particle horizon changes with time depends on the nature of the ________.
Big BangRedshiftHubble's lawMetric expansion of space

Question 7: The particle horizon of the ________ is the boundary that represents the maximum distance at which events can currently be observed.
Observable universeBig BangRedshiftDark matter

Question 8: The traveling object, however, experiences no strange effects and does, in fact, pass through the horizon in a finite amount of ________.
Proper timeSpacetimeTime dilationCoordinate time

Question 9: Third, the description of black holes given by general relativity is known to be an approximation, and it is expected that ________ effects become significant in the vicinity of the event horizon.
Quantum gravityKaluza–Klein theoryLoop quantum gravitySupergravity

Question 10: This is sometimes described as the boundary within which the black hole's ________ is greater than the speed of light.
MoonEscape velocitySolar SystemGravity assist

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