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In astrophysics, an event horizon is a boundary beyond which events cannot affect an outside observer. Wolfgang Rindler coined the term in the 1950s. [1]In 1784, John Michell proposed that gravity can be strong enough in the vicinity of massive compact objects that even light cannot escape. [2]
Within an apparent horizon, light does not move outward; this is in contrast with the event horizon. In a dynamical spacetime, there can be outgoing light rays exterior to an apparent horizon (but still interior to the event horizon). An apparent horizon is a local notion of the boundary of a black hole, whereas an event horizon is a global notion.
Below are select vocabulary differences between Spain and other Spanish-speaking countries. Words in bold are unique to Spain and not used in any other country (except for perhaps Equatorial Guinea which speaks a very closely related dialect, and to a lesser extent the Philippines).
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'90s Week: The 1997 sci-fi horror film flopped in theaters and with critics. On its 25th anniversary, the director tells us about the one thing that made audiences take a second look.
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The curvature of the horizon is easily seen in this 2008 photograph, taken from a Space Shuttle at an altitude of 226 km (140 mi). The horizon is the apparent curve that separates the surface of a celestial body from its sky when viewed from the perspective of an observer on or near the surface of the relevant body. This curve divides all ...
Horizon chart displaying the difference between greenhouse gas emissions of some European country and the corresponding European average for each year, ranging from 2012 to 2021. [8] When creating a horizon chart, the selection of the origin for the vertical axis, which determines the placement of the horizontal axis, is crucial.