| 单词 | nebular hypothesis |
| 释义 | nebular hypothesisnoun Astronomy.the theory that the solar system evolved from a mass of nebular matter: prominent in the 19th century following its precise formulation by Laplace. Origin of nebular hypothesisFirst recorded in 1830–40 Words nearby nebular hypothesisNebraska, Nebraskan, nebris, Nebuchadnezzar, nebula, nebular hypothesis, nebulated, nebulium, nebulize, nebulizer, nebulose Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for nebular hypothesis
British Dictionary definitions for nebular hypothesisnebular hypothesis nounthe theory that the solar system evolved from the gravitational collapse of nebular matter 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 Scientific definitions for nebular hypothesisnebular hypothesis [ nĕb′yə-lər ] A model of star and planet formation in which a nebula contracts under the force of gravity, eventually flattening into a spinning disk with a central bulge. A protostar forms at the nebula's center. As matter condenses around the protostar in the bulge, planets are formed from the spinning matter in the disk. This theory is widely accepted to account for the formation of stars and planetary systems such as ours. The first version of the nebular hypothesis was proposed in 1755 by the German philosopher Immanuel Kant and modified in 1796 by Pierre Laplace.♦ The nebula that according to this hypothesis condensed to form the solar system is called the solar nebula. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
| 随便看 |
|
英语词典包含192737条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。