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Topic: Light cones

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	Light cone - Wikipedia, the free encyclopedia
		In special relativity, a light cone is the pattern describing the temporal evolution of a flash of light in Minkowski spacetime.
		Since special relativity requires the speed of light to be equal in every inertial frame, all observers must arrive at the same angle of 45° for their light cones.
		In general relativity, the future light cone is the boundary of the causal future of a point and the past light cone is the boundary of its causal past.
	en.wikipedia.org /wiki/Light_cone (442 words)

	Time Supplement [Internet Encyclopedia of Philosophy]
		The backward light cone of event E is the imaginary cone-shaped surface of spacetime points formed by the paths of all light rays reaching E from the past.
		Their age difference isn't caused by anything, just as light's going at the speed of light instead of at some other speed isn't caused by something but is just the way nature behaves, at least insofar as the theory of relativity is concerned.
		Any measurement that produced a different value for the speed of light would be presumed initially to have an error in, say, its measurements of lengths and durations, or in its assumptions about the influence of gravitation and acceleration, or in its assumption that the light was moving in a vacuum.
	www.iep.utm.edu /ancillaries/time-sup.htm (12922 words)

	Star of Bethlehem,Magi,Astronomy,astrology,pi,archaeology,christmas
		The information contained in these essays is significant and controversial but inconsequential when compared with the timeless message of The Bible.
		Light Speed in Stone at the Giza Plateau
		Shield David superimposed upon an additional ancient configuration called"Gr Cross" (light* coloured square) which fers additional support for presenting this gr celestial display as star which informed Magi birth Christ; star which was invisible to all except Magi.
	www.templeofsolomon.org /sitemap.htg/sitemap.htm (2449 words)

	Time Travel and Modern Physics
		A time like curve is simply a space-time trajectory such that the speed of light is never equalled or exceeded along this trajectory.
		If there were time-like curves which were closed (formed a loop), then travelling along such a curve one would never exceed the speed of light, and yet after a certain amount of (proper) time one would return to a point in space-time that one previously visited.
		Earman, J. “Implications of causal propagation outsider the null cone,” in Foundations of Space-Time Theory, Minnesota Studies in the Philosophy of Science, Vol VII, Earman, J., Glymour, C., and Stachel, J. (eds), pp 94- 108.
	plato.stanford.edu /entries/time-travel-phys (12634 words)

	Top 20 Encyclopedia
		It was also on the London Sunday Times best-seller list for a record breaking 237 weeks
		It attempts to explain a range of subjects in cosmology, including the Big Bang, fl holes, light cones and superstring theory, to the nonspecialist reader.
		Its main goal is to give an overview of the subject but, unusually for a popular science book, it also attempts to explain some complex mathematics.
	encyc.connectonline.com /index.php/A_Brief_History_of_Time (277 words)

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