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Astronomy General Relativity Questions and Answers 100% Correct
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Astronomy General Relativity Questions and Answers 100% Correct
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Astronomy General Relativity Questions andAnswers 100% Correct
special Relativity - ANSWER Einstein's theory of time and space, formulated in
1905, which shows how
measurements of length and time differ for observers in relative motion. The
theory has
two basic propositions: that a spaceship traveling at uniform speed through space
contains its own space-time continuum, and that a ray of light passes an observer
at the
speed of light no matter how (uniformly) fast nor in what direction the observer is
traveling. The theory was generalized in 1915 to include gravity (see General
Theory of
Relativity).
Principle of Relativity - ANSWER The core principle of special relativity
declaring that all constant-velocity observers are
subject to an identical set of physical laws and that, therefore, every constant-
velocity
observer is justified in claiming to be at rest.
invariance of the speed of light - ANSWER One of the two key ideas of special
relativity, the principle that every observer in
uniform motion measures the same velocity for light.
, inertial reference frame - ANSWER Any reference frame that is not
accelerating.
inertial coordinate system - ANSWER A coordinate system in an inertial
reference frame.
absolute reference frame - ANSWER The idea inherent in Galilean mechanics
that there is a preferred frame of reference that
is at absolute rest with respect to the universe.
rest frame - ANSWER A reference frame that is at rest with respect to the
observer.
space - ANSWER The aspect of the universe described by the three-
dimensional coordinates of length,
width and height and explained by means of Euclidean geometry.
time - ANSWER A dimension distinguishing past, present, and future. In
relativity, time is portrayed as a
geometrical dimension, analogous to the dimensions of space.
spacetime - ANSWER The three physical dimensions of space combined with
time and forming the space-time
continuum that is used as the fundamental framework of the theory of relativity.
It can
be thought of as the "fabric" out of which the universe is fashioned.
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