event horizon


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event horizon

n.
The region, usually described as spherical, marking the outer boundary of a black hole, inside which the gravitational force is strong enough to prevent all matter and radiation from escaping.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

event horizon

n
(Astronomy) astronomy the surface around a black hole enclosing the space from which electromagnetic radiation cannot escape due to gravitational attraction. For a non-rotating black hole, the radius is proportional to the mass of the black hole
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

event′ hori`zon


n.
the boundary around a black hole on and within which no matter or radiation can escape.
[1970–75]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
The dwarf planet is located 39.5 astronomical units (AU) from its star while the black hole has an event horizon that is nearly 790 AU.
In Volume 5, both the humans and the gigantic Zentraedi aliens find traitors among their ranks, and the "Event Horizon" event draws ever closer.
Matter closer to the event horizon glows brilliantly bright with the heat of hundreds of Suns.
More than 200 scientists were involved in taking the image, through the Event Horizon Telescope, in a project which spanned across a decade.
A handout photo provided by the European Southern Observatory on April 10, 2019 shows the first photograph of a black hole and its fiery halo, released by Event Horizon Telescope astronomers (EHT), which is the "most direct proof of their existence," one of the project's lead scientists told AFP.
The company released a statement on Thursday claiming that it had gained copyright of the image from the Event Horizon Telescope for use in media and not for commercial use such as advertisements.
"Correlators" were designed and built for that purpose, one of which was developed by the Massachusetts Institute of Technology for the Event Horizon Telescope and another by the Max Planck Institute for Radio Astronomy in Bonn, Germany, for the other group collaborating in the project, the GMVA.
While a black hole itself is by its nature invisibly dark, astronomers can observe the Event Horizon maelstrom with sufficiently powerful instruments.
Despite black holes being invisible due to their extreme density and gravitational field, researchers have managed to obtain images near the point where matter and energy can no longer escape, which is referred to as event horizon.
A black hole's event horizon is the point of no return beyond which anything -- stars, planets, gas, dust and all forms of electromagnetic radiation -- gets swallowed into oblivion.