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Interstellar cloud

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Local Interstellar Cloud
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Interstellar cloud is the generic name given to an accumulation of gas, plasma and cosmic dust in milky way and other galaxy. Put differently, an interstellar cloud is a denser-than-average region of the interstellar medium....
of dust
Cosmic dust ...

Interstellar Cloud
A collection of gas and dust that lies between the stars.
Interstellar Dust ...

3 Interstellar Clouds
A substantial fraction of the gas in the interstellar medium is in molecular form. This gas is in the form of dense, cold "molecular clouds". This component of the interstellar medium is very closely connected with star formation.

Interstellar cloud
Interstellar medium
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Astrochemistry".

~ - (n.)
A region of relatively high density in the inter- stellar medium. ~s have densities ranging between 1 and 10'' particles per cubic centimeter, and in aggregate, contain most of the mass in interstellar space.
interstellar extinction - (n.) ...

"~s and circumstellar envelopes act as formation regions for complex molecules," she says. "Organic molecules that are able to survive include polycyclic aromatic hydrocarbons (PAHs) that are seen in the infrared spectrum of distant galaxies.

The ~s in and around M20 thus provide tentative evidence of three distinct phases of star formation, as shown in Figure 19.8. The huge, dark molecular cloud surrounding the visible nebula is the stage 1 cloud.

NEBULA - ~ of gas and dust. The properties of nebulae vary enormously and depend on their composition as well as the environment in which they are situated.

A nebula is an ~ of dust, hydrogen gas and plasma. It is the first stage of a star's cycle.

Nebulae are ~s of matter, usually gases such as hydrogen and dust. Many nebulae are stellar nurseries. For more information, please see the main article about nebulae.
This is a list of all nebulae.

The weaker component of a pulsar pulse when its period is roughly half that of the main pulse. [H76]
A collection of gas and dust that lies between the stars. [C95]
Interstellar Dust ...

~ the clumping of interstellar gas and dust into immense clouds having higher densities of matter than the space between clouds (see also dark and diffuse clouds).

HI cloud: An ~ of neutral hydrogen.
high-velocity star: A star with a large space velocity. Such stars are halo stars passing through the disk of the galaxy at steep angles.
HII region: A region of ionized hydrogen around a hot star.

Molecular Cloud
An ~ of molecular hydrogen containing trace amounts of other molecules such as carbon monoxide and ammonia.
A term used to describe a point directly underneath an object or body.

Filled with bright hot stars, Centaurus is a centerpiece of "associations" of them, which are vast groups of stars born mostly at the same time from the same huge complex of ~s. Unbound gravitationally, associations, unlike clusters, expand away into the Galaxy.

In recent millenia, the Sun has been passing through a Local ~ (LIC) that is flowing away from the Scorpius-Centaurus Association of young stars dominated by extremely hot and bright O and B spectral types, many of which will end their brief lives violently as supernovae.

A star forms when a dense ~ of hydrogen and dust grains collapses inward under the force of its own gravity. As the cloud condenses, its density and internal temperature increase until reaching incandescence with a faint red glow.

a star or an ~). The various characteristics of molecules reveal themselves in their spectra, yielding a unique spectral representation corresponding for a molecule.

Glycolaldehyde (C2H402) is a type of simple sugar that was recently found in a giant ~ of gas and dust [called Sagittarius B2 (North)], located near the center of the Milky Way Galaxy, about 26,000 light-years from Earth.

The stellar nucleosynthesis theory correctly predicts the observed abundances of all of the naturally-occuring heavy elements seen on the Earth, meteorites, Sun, other stars, ~s---everywhere in the universe.

Giant molecular clouds are ~s of cold gas (mainly molecular hydrogen) and dust that weigh as much as tens or hundreds of thousands of Suns. Mainly found in spiral galaxies, they are the sites for the majority of star formation.

diffuse nebula - an ~ of dust and gas consisting mostly of hydrogen and helium, but other ionized gasses may be present; diffuse nebulae are often associated with star forming regions in which the force of gravity collapses the cloud into clumps and knots, ...

This assumes that initially there is a dense ~ which will eventually produce a cluster of stars. Dense regions in the cloud form and coalesce; as the small blobs have random spins the resulting stars will have a low rotation rates. The planets are smaller blobs captured by the star.

The solar wind blows a bubble in space inside the ambient interstellar medium, or partially ionized gas of the small local ~ that the sun travels through.

A nebula is an ~ that is made up of dust, hydrogen and helium gas, and plasma. It is formed when portions of the interstellar medium collapse and clump together due to the gravitational attraction of the particles that comprise them.

- Dark nebulae are dense ~s of cold gas and dust. Some, like the Doodad, obscure light from background stars. Others, like the Horsehead Nebula in Orion, block light from emission nebulae in young star-forming regions. Either way, dark nebulae look like "holes" in space.

1. How does the temperature of an ~ affect its ability to form stars?
Higher temperatures inhibit star formation.
Higher temperatures help star formation.
Star formation doesn't depend on the cloud's temperature.
Could be either a or b depending on the clouds rotation rate.

Emission Nebula
An ~ of gas and dust in which hot embedded stars ionize much of the cloud's gas atoms causing the nebula to emit its own light. The name is derived from the pattern of emission lines in the spectra of these nebulas. Examples include the Orion and Lagoon nebulas.

Nebulae - they are huge ~s composed of ionized gases (over 95% hydrogen) and dust. The nebulae in our galaxy are called galactic nebulae, while those in other galaxies are called extragalactic nebulae. There are four types of nebulae.

molecular cloud A cold, dense ~ which contains a high fraction of molecules. It is widely believed that the relatively high density of dust particles in these clouds plays an important role in the formation and protection of the molecules.

Immediately surrounding our solar system is a warm, partly ionized cloud, called the Local ~. Like most ~s, its gas comprises about 90% hydrogen and 10% helium. Roughly 1% of the cloud's mass is dust.
Approximate Typical Conditions in Galaxy ...

The Lagoon Nebula, or Messier 8 (NGC 6523), is a large ~, 110 by 50 light-years in dimension, identified as an emission nebula. It lies near [7301] lambda Sagittarii and is about 4,100 light-years distant.

Arcturus lies on the celestial equator and can easily be found if one follows the arc of the three bright stars that form the handle of the Big Dipper asterism in Ursa Major. It is a member of the Local ~ (or Local Fluff), ...

Molecular Cloud - A relatively dense, cool ~ in which molecules are common
Momentum - A quantity, equal to the product of a body's mass and velocity, used to describe the motion of the body. When two bodies collide or otherwise interact, the sum of their momenta is conserved ...

Even a tiny salting of heavy elements changes the cooling of ~s and the properties of the resultant stars dramatically.

Since I was a kid I read that we can't see the center due to dark ~s. Though they've now detected the effects of the massive black hole there.
"and the Andromeda galaxy is maybe a bit less massive, though it's actually spread out more" ...

The Eagle nebula, a stellar nursery illuminated by ultraviolet light which is emitted from the newborn stars.
Stars are formed in nebulae, ~s of dust and gas (mostly hydrogen). These stellar nurseries are abundant in the arms of spiral galaxies.

The intrinsic composition of ~s, the birth of stars, and the properties of stars whose lives have passed, are all observable with the radio telescope where these mysteries are masked to the optical instruments.

Inverse Problem of Photon Transport in ~s
Comments Off ...

The Submillimeter Wave Astronomy Satellite, was launched on December 5, 1998 and made observations until July 21, 2004. SWAS measured the amount of water and molecular oxygen in ~s, and also the amounts of carbon monoxide and atomic carbon, ...

SWAS will, for the first time by direct observation, measure the amount of water and molecular oxygen in ~s. SWAS also will measure carbon monoxide and atomic carbon, which are believed to be major reservoirs of carbon in these clouds.

This cluster is behind a huge ~ of gas and dust which blocks most of its visible light. The dimming factor is more than 100,000 -- and this is why it has taken so long to uncover the true nature of this particular cluster.

Binary star: A system of two stars orbiting around a common center of mass due to their mutual gravity. Binary stars are twins in the sense that they formed together out of the same ~.

The study of spectral lines from different atoms and molecules. Spectroscopy is an important part of studying the chemistry that goes on in stars and in ~s.

and can fly at an altitude of 41,000 feet which is above 99 percent of the Earth's water vapor. In addition to being able to study additional infrared wavelengths, airborne observatories can detect fainter infrared objects which cannot be observed well from the ground (such as ~s).

Molecules such as acetic acid and formaldehyde have been discovered in ~s and the search continues for the signature of amino acids such as glycine. Information on these will prove vital for astrobiologists and astrochemists.

Spectroscopy is an important part of studying the chemistry that goes on in stars and in ~s. spectrum (NASA SP-7, 1965) 1. In physics, any series of energies arranged according to wavelength (or frequency).

See also: See also: What is the meaning of Interstellar, Astro, Star, Sun, Solar?

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