a cloud of interstellar gas and dust that absorbs and thus obscures the light from stars behind it, appearing as a dark patch in front of a bright nebula or in an otherwise bright area of sky.
The Deep Web Vs. The Dark WebDeep web and dark web are so technical in nature that we came across a lot of confusion as to what they actually mean in our research. More tech-savvy publications generally have a disclaimer when discussing the dark web, pleading with their readers that this is not to be confused with the deep web, which is related, but not at all the same thing. So, what exactly are the dark web and the deep web, and why are technology reporters so wary when using either term?
Before X Was X: The Dark Horse Story Of The 24th LetterSince its inception, the letter X has struggled to establish its own identity, so it may be no coincidence that X is commonly used to represent the unknown in both language and mathematics. But, how was it created?
- dark lantern,
- dark matter,
- dark meat,
- dark mineral,
- dark money,
- dark of the moon,
- dark reaction,
- dark slide,
- dark star,
- dark tourism
Origin of dark nebula
First recorded in 1930–35
Also called absorption nebula.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a type of nebula that is observed by its blocking of radiation from other sourcesSee nebula
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
See absorption nebula.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.