nebula theory articles - Page: 4
What is the leading scientific explanation for the formation of our solar system architecture?
Approximately how long ago did the Sun and planets begin coalescing from the solar nebula?
What two elements made up roughly 98% of the mass in the original solar nebula?
What event is cited as the most common mechanism for disturbing the nebula's equilibrium and initiating gravitational collapse?
Which physical principle caused the cloud to spin faster as it contracted, leading to its flattening?
What is the term for the vast, thin, spinning structure that the spherical nebula transformed into?
What was the dense, hot concentration of matter at the center of the disk called before nuclear fusion ignited?
What is the process through which microscopic dust grains in the disk built up into larger bodies?
What were the kilometer-sized objects that acted as the primary builders of the major planets?
What phenomenon causes the inner terrestrial planets to be composed mainly of rock and metal?
What compositional feature defines the region where temperatures were low enough for water, methane, and ammonia to condense into solids?
What process primarily causes emission nebulae to produce their own glow?
What stellar characteristic is required to maintain the ionization necessary for an emission nebula to glow?
What is the initial atomic process caused by high-energy photons striking gas atoms in an emission nebula?
What is the name given to a cloud composed mainly of ionized atoms, often used interchangeably with emission nebula?
In hydrogen gas within an emission nebula, what specific transition yields the characteristic deep red emission line ($ ext{H}oldsymbol{ ext{alpha}}$)?
What spectral signature typically contributes a distinct blue-green glow to an emission nebula's palette?
How do astronomers often present the complex elemental composition of nebulae in processed images?
What causes the sculpted, complex shapes like pillars seen in emission nebulae?
Why are emission nebulae intrinsically linked to star formation regions?
What dictates the specific wavelength (color) of the photon released during the recombination phase?
What is the dominant gas component making up the bulk of an emission nebula's cloud?
What process drives the characteristic glow observed in an emission nebula?
What specific type of high-energy radiation is necessary to initiate the glow process in an emission nebula?
What is the term for the initial process where intense UV radiation strips electrons away from gas atoms?
Once gas is ionized, what process leads to the emission of visible photons?
What is the most prominent visual color observed in classic emission nebulae?
Which specific atomic transition in hydrogen is responsible for the nebula's dominant red glow?
What wavelength corresponds to the Hydrogen-alpha ($ ext{H} extalpha$) emission line?
What characteristic defines the type of stars necessary to power an emission nebula?
How does the primary light mechanism of an emission nebula contrast with that of a reflection nebula?
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