CE ÎNSEAMNĂ PROTOSTAR ÎN ENGLEZĂ?
Protostar
Un protostar este o masă mare care se formează prin contracția din gazul unui nor molecular gigantic în mediul interstelar. Faza protostelară este o etapă timpurie în procesul de formare a stelelor. Pentru o stea de masă solară durează aproximativ 10.000.000 de ani. Începe cu un nucleu de densitate crescută într-un nor molecular și se termină cu formarea unei stele T Tauri, care apoi se dezvoltă într-o stea secvență principală. Acest lucru este semnalat de vântul T Tauri, un tip de vânt super-solar care marchează schimbarea de la masa care accrejează masa în energia radiantă.
Definiția protostar în dicționarul Engleză
Definiția protostarului în dicționar este un nor de gaz interstelar și praf care se prăbușește treptat, formând un nucleu dens de fierbere și evoluează într-o stea după ce fuziunea nucleară poate apărea în nucleu.
CĂRȚI ÎN ENGLEZĂ ÎN LEGĂTURĂ CU «PROTOSTAR»
Descoperă întrebuințarea
protostar în următoarea selecție bibliografică. Cărți în legătură cu
protostar și extrase din aceasta pentru a furniza contextul de întrebuințare al acestuia în literatura Engleză.
1
Astronomy: A Physical Perspective
For a protostar, the continuous spectrum peaks in the near infrared. The dust in
the collapsing cloud surrounding the protostar will absorb some of the radiation.
The dust will be heated, but will not be the same temperature as the star.
2
Horizons: Exploring the Universe
Although the term is used rather loosely by astronomers, a protostar can be
defined as a stellar-mass object that is compressed and hot enough to be
opaque to the radiation it is emitting internally but not yet compressed and hot
enough to ...
Michael Seeds, Dana Backman,
2013
3
Evolution of Interstellar Matter and Dynamics of Galaxies
Although the protostar condenses out between ti and tj , it is buried deep within
the densest part of the layer and cannot be resolved on the scale of Figure Id. In
Figures 2a-d, the density at each particle is plotted against x. The times are the ...
J. Palous, William Butler Burton, P. O. Lindblad,
1992
4
Planetary Science: The Science of Planets around Stars, ...
Such a protostar would have a radius about 1100 au. For such a protostar, the
luminosity from Equation G.1 is 1.6 X 1028 W - or about 40 times the luminosity of
the Sun. Although the protostar has a low temperature, it also has a very large ...
George H. A. Cole, Michael M. Woolfson,
2013
5
Universe: The Solar System
The Evolution of a Protostar In the 1950s, astrophysicists such as Louis Henyey
in the United States and C. Hayashi in Japan performed calculations that
enabled them to describe the earliest stages of a protostar. At first, a protostar is
merely a ...
Roger Freedman, Robert Geller, William J. Kaufmann,
2010
6
Astrophysics is Easy!: An Introduction for the Amateur ...
The dust in the vicinity of a protostar, often called a cocoon nebula, absorbs the
light, and so it is very difficult to observe at visible wavelengths.5 On the other
hand, they can be seen at infrared wavelengths... but this does not really help us,
...
Woolfson's suggestion is that the Sun was formed in a star cluster and that after it
became a main sequence star it had a close passage with a very much larger
protostar. As a result it pulled out some material from the protostar and some of
this ...
8
Conducting Astronomy Education Research: A Primer
Because it absorbs so much energy from its central protostar, the dust
surrounding a protostar becomes greatly heated to a few hundred kelvins. The
warmed dust then reradiates its thermal energy at infrared wavelengths, to which
normally ...
Janelle M. Bailey, Timothy F. Slater, Stephanie J. Slater,
2010
9
Discovering the Universe: From the Stars to the Planets
7-3 When a protostar ceases to accumulate mass, it becomes a pre-main-
sequence star Protostars are physically larger than the main-sequence stars into
which they are evolving. A protostar of 1 Mo, for example, has about 5 times the ...
Neil F. Comins, William J. Kaufmann,
2008
10
On the Origin of Planets: By Means of Natural Simple Processes
Characteristics of the protostar Mass of the protostar, Mp I 7 >< 1029 kg w 0.35M9
Initial radius of the protostar, Rp I 800 au Initial temperature of the protostar, Tp I
20K Mean molecular mass of protostar material, /a I 4 >< 10-27 kg ...
ȘTIRI NOI CARE INCLUD TERMENUL «PROTOSTAR»
Află ce ziare naționale și internaționale au scris despre și cum este întrebuințat termenul
protostar în contextul următoarelor știri.
'Sling Kong' is the Next Game from 'Checkpoint Champion …
One of my unexpected favorites of 2014 was Checkpoint Champion [Free], as Protostar nailed pretty much every aspect of their game from top to bottom, earning ... «Touch Arcade, Iun 15»
Newborn Star Erupts After Binging on Gas and Dust
Although a Class 0 protostar has yet to generate energy by fusing hydrogen into helium deep in its core, it still shines, albeit faintly. As the protostar collapses ... «Space.com, Apr 15»
Astronomers Spot the Moment a Massive Protostar Develops …
For the first time ever, astronomers have spotted the moment in which a massive protostar begins to develop jets of matter and energy crucial for star formation. «Science World Report, Apr 15»
Scientists watch a massive protostar turn on the jets
With a pair of observations 18 years apart, they've spotted what appear to be large jets of material erupting from a massive protostar. The findings provide ... «Ars Technica, Apr 15»
Massive Protostar Growth In Real Time
There are many different shapes and sizes of stars in our solar system and in our universe. There have been many massive protostar studies done in the past, ... «Clapway, Apr 15»
NASA satellites catch a “growth spurt” from a newborn protostar
By the end of this process, the collapsing fragment has transformed into a hot central protostar surrounded by a dusty disk roughly equal in mass, embedded in a ... «Astronomy Magazine, Mar 15»
Image of protostar suggests planets form earlier
This is an image of a protoplanetary disk – the ring of gas and dust that astronomers think surrounds most forming stars (also called protostars). This is amazing ... «Charlotte Observer, Ian 15»
Protostar is a new mobile studio from a couple of Halfbrick vets
Protostar is Matt Knights and Dean Loades. Knights has been lead artist at Halfbrick since 2007, while Loades was a Halfbrick programmer from 2006 onwards. «Gamasutra, Nov 14»
Peeking In On A Protostar and A Not-Quite-Star Hiding In Clouds of …
What happens when you take observations of a gas cloud, a protostar, and a pre-star dense core of gas, and model them with turbulence? A downright ... «io9, Aug 14»
A Protostar's Age Gleaned Only From Sound Waves
The latest research is providing a new technique, showing that protostars can ... As each cloud — protostar — continues to collapse, the core gets hotter, until the ... «Universe Today, Iul 14»