the final stage of stellar evolution in which a star collapses to a final state, as a white dwarf, neutron star, or black hole, when the star's nuclear reactions no longer generate enough pressure to balance the attractive force of gravity.
the initial stage of stellar evolution in which interstellar gases and dust contract under gravity and condense into one or more stars.
dark matterRead more in this article about some frequently asked questions and fun facts related to our definitions.
What do you call a sandwich made on a roll?Do you call it a sub? A grinder? A hoagie? A poor boy? That all depends on where you live. The Dictionary of American Regional English has been more than 40 years in the making. In the early 60s, lexicographers and linguists led by the University of Wisconsin at Madison sprawled all over the country in search of unique words. They found zin-zins (a duck …
- gravitational constant,
- gravitational field,
- gravitational interaction,
- gravitational lens,
- gravitational mass
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
[ grăv′ĭ-tā′shə-nəl ]
The implosion of a star or other celestial body as a result of its own gravity, resulting in a body that is many times smaller and denser than the original body.
The process by which stars, star clusters, and galaxies form from interstellar gas under the influence of gravity. Clusters of matter are drawn together by gravitational pull, with additional matter continuing to accumulate until the growing nebula develops into even denser gaseous bodies such as stars or groups of stars.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.