x-ray nebulae

x-ray nebulae

[′eks ‚rā ′neb·yə‚lī]
(astronomy)
The remnant of an ancient supernova that has been identified as a source of x-rays; an example is the Crab Nebula.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.