Emission nebula
An emission nebula is a cloud of ionized gas (i.e. a plasma) emitting light of various colors. The most common source for ionization are high-energy photons emitted from a nearby hot star.
Emission nebula
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An emission nebula is a type of nebula that emits its own light, due to the presence of ultraviolet radiation from very hot young stars inside. Cloaking devices are useless inside emission nebulae.
Emission Nebula
High energy UV photons ionise the hydrogen in the interstellar gas cloud. As the hydrogen recombines and returns to its neutral state, optical photons are emitted.
Emission Nebula NGC1491 in Perseus
(RA 4h 03.4m , Dec. +51°19', 25 x 25 arcmin.) ...
Emission Nebulae
An emission nebula is a cloud of dust and gas that shines due to the emission of its own light.
emission nebula A glowing cloud of hot interstellar gas. The gas glows as a result of a nearby young star which is ionizing the gas.
emission nebula
a cloud of very hot gas that is being illuminated from within by the radiation of energetic, young stars
ephemeris ...
Emission nebula A cloud of glowing gas excited by ultraviolet radiation from hot stars.
Ephemeris (plural ephemerides) A tabulated list of positions for an object calculated from its orbital elements.
Emission Nebula: A cloud of gas that is excited by the ultraviolet radiation from hot stars.
Emission nebula
a type of nebula that shines by emitting light when electrons recombine with protons to form hydrogen atoms. The electron frequently approaches the proton in steps emitting energy as light as it gets pulled in.
Emission Nebula
A cloud of gas excited by UV wavelengths of hot stars,
Emission Spectrum ...
EMISSION NEBULA
An emission nebula is a nebula that glows; it emits light energy. The reddish light is produced when electrons and protons combine, forming hydrogen atoms.
Emission nebulae are the most colorful of the five main types of nebulae. They are lit internally from young stars still in their stellar nursery. The different colors are caused by the different gases and the composition of the dust in the nebula.
Emission nebulae are by no means the only generators of interstellar shock waves.
Emission nebula are also known as HII regions. The explanation of this nomenclature is this: The H means Hydrogen and the Roman numeral II means that the hydrogen is ionized (its electron has been stripped off by high energy photons).
Emission nebulae are composed of gases (mostly hydrogen) that have been excited by stars' emitted radiation. When gas atoms get excited, they glow like a neon sign.
Emission nebulae are clouds of high temperature gas. The atoms in the cloud are energized by ultraviolet light from a nearby star and emit radiation as they fall back into lower energy states (in much the same way as a neon light).
emission nebula - (n.)
A cloud of interstellar gas that glows by the light of emission lines. The source of excitation that causes the gas to emit may be radiation from a nearby star, or heating by any of a variety of mechanisms.
energy - (n.) ...
An emission nebula (NGC 7000) in Cygnus. [H76]
North Galactic Pole
A point in the constellation Coma Berenices where we look perpendicular to and above the Galactic Plane.
This faint emission nebula is located 2°20' SSE of p2 Cygni (see finder chart below). A 2° long complex of dark filaments extending NW and W of Cocoon corresponds to B168 dark nebula.
H II regions are regions of hot (several thousand K), thin hydrogen emission nebulae that glow from the fluorescence of hydrogen atoms. The roman numeral ``II'' of H II means that hydrogen is missing one electron.
nebulae: dark nebula, emission nebula, reflection nebula, planetary nebula
Rho Ophiuchi, pleiades
zone of avoidance, interstellar medium, neutral hydrogen emission
cosmic rays
Baade's Window, bulge ...
Some bright nebulae, composed primarily of hydrogen gas ionized by nearby hot blue-white stars, radiate their own light; they are called emission nebulae and are characterized by narrow spectral emission lines.
Many of the objects in Sagittarius are emission nebulae and a list of them can be found here.
Other objects in Sagittarius
AAT 20 NGC 6589-90 reflection nebulae in Sagittarius
AAT 22 NGC 6520 open cluster and Barnard 86 ...
What causes the green color of certain emission nebulae?
What is interstellar matter?
Can interstellar material be visible through telescopes?
What is interstellar gas made up of?
What is emission nebula?
What makes up interstellar matter?
The California Nebula (NGC 1499) is an emission nebula that got its name because it resembles the outline of the State of California. It was discovered in the mid-19th century by the American astronomer Edward E. Barnard.
PLANETARY NEBULA - Emission nebula formed when a red giant star blows off its outer envelope. A planetary nebula results when the ejected material is heated by strong UV radiation from the hot central star.
The pink regions are typical of an emission nebula, and signifies the presence of scorching new-born stars emitting the signature red light of hydrogen.
Many emission nebulae and most planetary nebulae will look remarkably better through an OIII filter, which is manufactured by Lumicon, Thousand Oaks, and Meade, to name a few.
The red colors represent what is known as an emission nebula, where ionized hydrogen (which was excited by energy from nearby young, hot stars) falls back to its unexcited, normal, run of the mill ground state.
Attilla Danko:
"Big emission nebulae. Like M42, The Veil and the North American Nebula. These are just breathtaking in a short focus refractor with a wide field eyepiece and narrowband nebula filter." ...
This is the Eagle Nebula, which is an emission nebula 7,000 light years away. There are many new stars formed here, but the nebula itself is much dimmer and harder to see than the nearby Omega Nebula.
(89K JPG) ...
An emission nebula shines by emitting light as electrons recombine with protons to form hydrogen. The electrons were made free by the ultraviolet light of a nearby star shining on a cloud of hydrogen gas.
A glowing cloud of gas in interstellar space. The cloud of gas may be either an emission nebula, which absorbs ultraviolet light from nearby stars and re-radiates visible light, or a reflection nebula, which reflects light off of its dust particles.
Emission factorEmission ImpossibleEmission nebula
Emission Reduction UnitEmission spectroscopyEmission spectrum
Emission spectrum (fluorescence spectroscopy)Emission standardEmission test cycle ...
The Horsehead nebula B33 is a dark dust cloud in front of emission nebula IC434. The shape of the dust cloud gives the nebula its name.
Below the belt star Alnitak is the Flame nebula NGC2024.
dust lane A lane of dark, obscuring interstellar dust in an emission nebula or galaxy.
dwarf Any star with a radius comparable to, or smaller than that of the Sun (including the sun itself).
Infrared imagery of a two degree wide strip along the galactic equator from L 65° (Vulpecula) to 295° (Centaurus), showing hydrogen emission nebulae (red and yellow, 24 micron), polycyclic aromatic hydrocarbons or "carbon dust" molecules (green, ...
DUST LANE
A dust lane is lane of dark interstellar dust in a galaxy or emission nebula. Dust lanes obscure light.
NCC 7000 is called "North American Nebula" because of its shape. It's a bright slightly greenish emission nebula.
3 nm, the Hydrogen-Alpha wavelength of red emission nebula. By filtering out the rest of the spectrum, much more contrast is gained in the wavelength of interest, at the cost of increase exposure time.
For example, H II regions, like the Orion Nebula, where a lot of star-formation is taking place, are characterized as thermal emission nebulae.
In addition to the diffuse background radiation, numerous discrete sources of radio emission exist in the Galaxy. These discrete sources include the following: supernova remnants, radio stars, emission nebulas, molecular clouds, and pulsars.
Plasma physics is used to describe the gas within a star and in the emission nebula floating between stars. Our universe provides conditions not achievable in the laboratory, so we see physical processes in space that we cannot duplicate on Earth.
 See also: Emission, Nebula, Light, Star, Earth
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