light-echo model

light-echo model

[′līt ‚ek·ō ‚mäd·əl]
(astronomy)
An explanation of superluminal motion wherein an outburst from the center of a quasar illuminates regions at successively greater radii.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.