Interstellar Gas and Dust
The gas between stars is mostly hydrogen and helium scattered at varying densities between the stars in our galaxy and other galaxies. The proportions of the gases are similar to those in the Sun.
Interstellar Gas Cloud
About 99% of the interstellar medium is in a gaseous state, with hydrogen making up 90% of the atoms.
Interstellar Gas
Sparse, cool gas (mainly hydrogen) in interstellar space. Dust absorbs and scatters radiation; gas does not interact directly with radiation but is coupled to the dust by collisions.
Interstellar gas in the Galactic disk exhibits an organized pattern on a grand scale. According to radio studies, the center of the gas distribution coincides roughly with the center of the globular-cluster system, about 8 kpc from the Sun.
Interstellar gas Single particles (atoms, molecules, and ions) in the interstellar medium. Interstellar gas particles travel at considerably less than the speed of light, in contrast to galactic cosmic rays.
Interstellar gas
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Interstellar gas (99%) and dust (1%). The observed density of the interstellar medium is about 1-5 atoms per cm3. The two other components of the interstellar medium are magnetic fields and cosmic-ray electrons. [H76]
Interstellar Medium ...
A cloud of interstellar gas and/or dust (the "solar nebula") is disturbed and collapses under its own gravity. The disturbance could be, for example, the shock wave from a nearby supernova.
a cloud of interstellar gas and dust; some nebulae represent stellar nurseries, others represent stellar graveyards
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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.
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Most of this interstellar gas and dust originates from the death of stars which either exploded (supernova) or blew off their outer layers, returning their material to interstellar space. From this material, new stars are formed.
"The drag from interstellar gas only affects the outskirts of the disc, where the star's gravity can't really hold onto the material," says team member Alycia Weinberger of the Carnegie Institution of Washington.
A collection of interstellar gas and dust whose gravitational pull is causing it to collapse on itself and form a star.
Pulsar
A neutron star that emits rapid and periodic pulses of radiation.
nebulae (NASA Thesaurus) Clouds of interstellar gas and dust, seen either as a luminous patch of light or a dark cloud against a bright background.
The most conspicuous property of interstellar gas is its clumpy distribution on all size scales observed, ...
Buried within, and in the foreground, are long black streamers and clouds of dusty interstellar gas that are associated with new star formation.
Radio waves are usually emitted by cold objects, including interstellar gas and dust clouds. The cosmic microwave background radiation is the redshifted light from the Big Bang. Pulsars were first detected at microwave frequencies.
A cloud of interstellar gas, dust, and ices containing several generations of material collapsed to form the nebula from which the Sun and the rest of our solar system grew. This collapse may have been triggered by a nearby supernova.
MOLECULAR CLOUD - Cold dense complex of interstellar gas and dust roughly 75% hydrogen and 21-24% helium. Clouds contain trace amounts of other molecules, of which well over 100 different types have now been discovered in space.
The picture that is now widely accepted is that the solar system evolved from a large, slowly rotating cloud of interstellar gas and dust. This cloud was massive enough that it began to collapse due to its own gravity.
As the expanding gas crashes into the surrounding interstellar gas at thousands of kilometers/second, the shock wave heats up the interstellar gas to very high temperatures and it glows.
Sweeping up of a shell of shocked circumstellar and interstellar gas. This begins the Sedov-Taylor phase, which can be well modeled by a self-similar analytic solution. Strong X-ray emission traces the strong shock waves and hot shocked gas.
The initial phase of stellar evolution is contraction of the protostar from the interstellar gas, which consists of mostly hydrogen, some helium, and traces of heavier elements.
To summarize the states of interstellar gas:
HII regions: hot (10000K) ionized hydrogen surrounding hot O and B type stars. Detected by optical emission, particularly the red H alpha emission line.
Far from being a voracious devourer of stars and of interstellar gas, "our own" black hole is rather benign.
"M16, the Eagle Nebula shows newborn stars emerging from "eggs" - not the barnyard variety - but rather, dense, compact pockets of interstellar gas called evaporating gaseous globules (EGGs).
Galaxy: A large assemblage of stars (and sometimes interstellar gas and dust), typically containing millions to hundreds of billions of member stars.
In addition, a small amount of interstellar gas becomes trapped in the SNR shock and bounces back and forth across the shock, a process known as Fermi acceleration.
Further outwards, the signatures of the interstellar gas of the host galaxy are seen. That gas is strongly ionised by the central X-ray source: atoms are stripped of some or most of their electrons when illuminated by the powerful flux of X-rays.
The number of globular clusters, dust clouds and interstellar gas is determined in a similar fashion. In order to determine the number of galaxies in superclusters, volumes in cubic megaparsecs[7] (Mpc3) are selected.
If a substellar object was formed the way a star does, from a collapsing cloud of interstellar gas and dust, then it would be called a brown dwarf.
Dark nebulae are massive clouds of interstellar gases and dust, dense enough to block out most of the light from stars behind it.
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.
A micro-nebula is a type of interstellar gaseous formation. Lieutenant Commander Tuvok and Seven of Nine from the USS Voyager investigated a micro-nebula near Norcadia Prime in 2376. (VOY: "Tsunkatse")
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Nebula A cloud of interstellar gas and dust. See also emission, reflection and planetary nebula.
Node One of two points at which an orbit passes through a reference plane (usually the ecliptic).
The complex structure of N132D is due to the expanding supersonic shock wave from the explosion impacting the interstellar gas of the LMC.
Eventually, the solar wind runs into the electrically-charged particles and magnetic field in the interstellar gas. The solar wind abruptly slows down from supersonic to subsonic speed, creating a termination shock.
Experiment to see how solar wind and interstellar gas move through the solar system. IBEX is studying the boundary between the solar wind and interstellar space.
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Molecular Cloud: An interstellar gas cloud that enables the formation of molecules. Over 125 molecules have now been discovered in interstellar space through radio wavelength observations.
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In 1947, Bart Bok suggested that the small dark globules of interstellar gas and dust were undergoing collapse on their way to forming new stars. In recent years, a great deal of evidence supporting this proposal has been found.
Meanwhile the debris from the explosion streams out into space at a speed of about 5,000 kilometers per second, mixing with the existing interstellar gas.
molecular cloud: An interstellar gas cloud that is dense enough for the formation of molecules; discovered and studied through the radio emissions of such molecules.
molecule: Two or more atoms bonded together.
What is interstellar gas made up of?
What is emission nebula?
What makes up interstellar matter?
is interstellar matter the same as interstellar medium?
Wmat makes up the atmosphere on Mars?
Who was Cleomedes?
What made Cleomedes famous?
Heliopause - The boundary of the heliosphere, where the solar wind merges into the interstellar gas
Helioseismology - A technique used to study the internal structure of the Sun by measuring and analyzing oscillations of the Sun's surface layers ...
Dark lines in some stellar spectra that are formed by the interstellar gas.
Interstellar Medium
The gas and dust distributed between the stars.
The Jeans instability causes the collapse of interstellar gas clouds and subsequent star formation. It occurs when the internal gas pressure is not strong enough to prevent gravitational collapse of a region filled with matter....
criterion.
Because no such reactions occur on Jupiter, the ratio of deuterium to hydrogen there should be identical to the ratio of those isotopes in the cloud of interstellar gas and dust that collapsed to form the solar system 4.6 billion years ago.
Reflection Nebulae - A cloud of interstellar gas and dust that is luminous because the dust it contains reflects the light of a nearby star ...
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203. Interstellar Absorption Lines
Dark lines in some stellar spectra that are formed by the interstellar gas.
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204. Interstellar Medium
The gas and dust distributed between the stars.
What is particularly interesting about it is that the interstellar gas in the outer area rotates in the opposite direction from the stars and gas in the inner area, ...
of that supernova, which contains the material ejected from the exploded star, becomes the Crab Nebula, or M1. M1 is visible through a small telescope. Today, the Crab Nebula is still expanding and it will eventually dissolve in the interstellar gas ...
These processes included cosmic ray interactions with interstellar gas, supernova explosions, and interactions of energetic electrons with magnetic fields.
Jupiter may therefore represent a direct condensation of a portion of the primordial solar nebula-the great cloud of interstellar gas and dust from which the entire solar system formed about 4.6 billion years ago.
It is also involved with a large mass of interstellar gas, which it ionizes and causes to glow. Unusual among bright naked-eye stars, Sigma's light is reddened and dimmed by over a magnitude by interstellar dust.
 See also: Light, Earth, Sun, Solar, Dust
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