| 单词 | bl lac object |
| 释义 | BL Lac objectnounan extremely compact violently variable form of active galaxy Word Origin for BL Lac objectC20: named after BL Lacertae, first identified example found in the constellation Lacerta and originally thought to be a variable star Words nearby BL Lac objectblivit, Blixen, blizzard, blk., B.LL., BL Lac object, BLM, bloat, bloated, bloater, blob Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for BL Lac objectBL Lac object [ bē′ĕl′ läk′ ] A distant radio galaxy with an intensely bright active galactic nucleus that emits a jet of material directly toward the Earth. BL Lac objects may be a class of blazar, though there is evidence that they are an optical effect caused by gravitational lensing of some other bright object by an intervening galaxy. Also known as BL Lacertae objects. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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