nebular hypothesis

(redirected from Planet formation)
Also found in: Thesaurus, Encyclopedia.
Related to Planet formation: Herbig Ae-Be stars

nebular hypothesis

A hypothesis concerning the formation of stars and planets, and therefore the origin of the solar system, according to which a rotating nebula underwent gravitational collapse into a star with an accretion disk, from which planets condensed or formed by coagulation of dust particles into increasingly larger bodies.

nebular hypothesis

(Astronomy) the theory that the solar system evolved from the gravitational collapse of nebular matter

neb′ular hypoth′esis

the theory that the solar system evolved from a mass of nebular matter.

neb·u·lar hypothesis

An explanation of the origin of the solar system according to which a rotating nebula cooled and contracted, flattening into a disk shape with a central bulge. The matter in the disk condensed into the planets, their moons, asteroids, and comets, while the great mass at the center became the sun.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.nebular hypothesis - (cosmology) the theory that the solar system evolved from a hot gaseous nebulanebular hypothesis - (cosmology) the theory that the solar system evolved from a hot gaseous nebula
scientific theory - a theory that explains scientific observations; "scientific theories must be falsifiable"
cosmogeny, cosmogony, cosmology - the branch of astrophysics that studies the origin and evolution and structure of the universe
References in periodicals archive ?
NASA approved the contract under its Discovery Program, SwRI made the proposal as part of a science mission called Lucy that aims to survey the diversity of Trojan asteroids, which are believed to be the fossils of planet formation.
You run the risk that you evaporate a disk even before planet formation starts happening," he says.
The post Scientists in Larnaca explore planet formation appeared first on Cyprus Mail .
It also is the regime of giant impacts that characterize the final stages of planet formation.
6, 2014 /PRNewswire-USNewswire/ -- Astronomers have captured the best image ever of planet formation around an infant star as part of the testing and verification process for the Atacama Large Millimeter/submillimeter Array's (ALMA) new high-resolution capabilities.
The detection of this circumplanetary disk is a new, "novel aspect of this new evidence for planet formation," said Carr.
Terrestrial planet formation models indicate Earth went through a sequence of major growth phases: initially accretion of planetesimals, planetary embryos, over many tens of millions of years, then a giant impact by a large proto-planet that led to the formation of our Moon, followed by the late bombardment when giant asteroids several tens to hundreds of miles in size periodically hit ancient Earth, dwarfing the one that killed the dinosaurs only 65 million years ago.
In fact, HD 106906 b is unlike anything in our own solar system and throws a wrench in planet formation theories.
Planned for launch by 2024, the planet hunting mission has two aims - to discover what are the conditions for planet formation and the emergence of life and to establish how the solar system works.
FLIMSIEST excuse for a BBC US junket, on Richard Hammond Builds A Universe last week: "To find out what planet formation was like in the early solar system, I need the help of the.
The book proceeds from broad strokes to details, starting with planet formation and orbit determinants and proceeding through gross geological phenomena such as magnetic alignment, topography, and tectonics to the fine modulation of surface character through atmospheric and oceanic movement.
Endeavour will provide large, shared memory capability and will enable solutions for many NASA science and engineering applications, including simulation and modeling of global ocean circulation, galaxy and planet formation, and aerodynamic design for air and space vehicles.