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gegenschein (gāˈgənshīnˌ) or counterglow, a slight brightening of the night sky in the region of the zodiac directly opposite the sun, i.e., 180° from the sun. Discovered by the Danish astronomer Theodor Brersen in 1854, it is caused by reflection of sunlight by interplanetary dust particles that lie in the plane of the solar system. The brightening is relatively faint and is obscured by moonlight and, in the weeks on either side of the solstices, by the Milky Way. The gegenschein is one of several sky glows, as are zodiacal light and airglow.
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counterglow(kown -ter-gloh) See gegenschein.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.