past light cone

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• Light cone — in 2D space plus a time dimension. A light cone is the path that a flash of light, emanating from a single event (localized to a single point in space and a single moment in time) and traveling in all directions, would take through spacetime. If… …   Wikipedia

• Past — The past is the portion of time that has already occurred; [Hegeler, E. C., Carus, P. (1890). [http://books.google.com/books?id=3KoLAAAAIAAJ The Monist] . La Salle, Ill. [etc.] : Published by Open Court for the Hegeler Institute. page 443. ] it… …   Wikipedia

• cone — I UK [kəʊn] / US [koʊn] noun [countable] Word forms cone : singular cone plural cones * 1) an object with a circular base that rises to a point. Something in the shape of a cone is conical a large building shaped like a cone a tower with a cone… …   English dictionary

• Speed of light — The speed of light in the vacuum of free space is an important physical constant usually denoted by the letter c . [NIST and BIPM practice is to use c 0 for the speed of light in vacuum in accord with international standard ISO 31 5. See… …   Wikipedia

• Charity Island Light — Historic deteriorated Charity Island Light (before the rebuilding) Location Big Charity Island, Michigan Coordinates …   Wikipedia

• Chicago Harbor Light — Location Chicago, Illinois Coordinates 41°53 …   Wikipedia

• Milwaukee Pierhead Light — Location Milwaukee, Wisconsin Coordinates …   Wikipedia

• World line — In physics, the world line of an object is the unique path of that object as it travels through 4 dimensional spacetime.The concept of world line is distinguished from the concept of orbit or trajectory (such as an orbit in space or a trajectory… …   Wikipedia

• Causal contact — Two entities are in causal contact if there may be an event that has affected both in a causal way. Every object of mass in space, for instance, exerts a field force on all other objects of mass, according to Newton s law of universal gravitation …   Wikipedia

• Time — This article is about the measurement. For the magazine, see Time (magazine). For other uses, see Time (disambiguation). The flow of sand in an hourglass can be used to keep track of elapsed time. It also concretely represents the present as… …   Wikipedia

• Future — Futurity redirects here. For the ship, see MV Futurity. Near future redirects here. For the song, see The Near Future. For other uses, see Future (disambiguation). The Ghost of Christmas Yet to Come shows Scrooge his future in Dickens …   Wikipedia