physical double star
See under double star.
double rainbowRead more in this article about some frequently asked questions and fun facts related to our definitions.
Don’t Get Into Double Trouble With Double NegativesWhat’s a double negative? A double negative is when two negative words or constructions are used within a single clause. Sentences with double negatives are not grammatically correct . . . and they’re confusing. That’s because double negatives cancel each other out and make a positive. So, when you use a double negative it ends up being the exact opposite of what you mean. You’ll …
Definition for physical double star (2 of 2)
two stars that appear as one if not viewed through a telescope with adequate magnification, such as two stars that are separated by a great distance but are nearly in line with each other and an observer (optical double star), or those that are relatively close together and comprise a single physical system (physical double star).
Compare binary star.
Origin of double star
First recorded in 1775–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for physical double star
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
Science definitions for physical double star
See binary star.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.