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Interstellar cloud

Astronomy  Interferometry  Interstellar Gas
04/21/2014

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 ...

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".

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

"Interstellar clouds and circumstellar envelopes act as formation regions for complex molecules," she says.

The interstellar clouds 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 - Interstellar cloud 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 interstellar cloud of dust, hydrogen gas and plasma. It is the first stage of a star's cycle.

Nebulae are interstellar clouds 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]
Interstellar Cloud
A collection of gas and dust that lies between the stars. [C95]
Interstellar Dust ...

interstellar cloud 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).

A globule is an interstellar cloud of dust and hydrogen gas that contracts and undergoes gravitational collapse to form a star.

HI cloud: An interstellar cloud 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.

Molecular Cloud
An interstellar cloud of molecular hydrogen containing trace amounts of other molecules such as carbon monoxide and ammonia.
N
Nadir
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 interstellar clouds.

In recent millenia, the Sun has been passing through a Local Interstellar Cloud (LIC) that is flowing away from the Scorpius-Centaurus Association of young stars dominated by extremely hot and bright O and B spectral types, ...

A star forms when a dense interstellar cloud 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 interstellar cloud). 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 interstellar cloud 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, interstellar clouds---everywhere in the universe.

Giant molecular clouds are interstellar clouds 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 interstellar cloud of dust and gas consisting mostly of hydrogen and helium, but other ionized gasses may be present; ...

All planetary and stellar systems are born from the collapse of dense interstellar clouds. The clouds may originally be very large (even thousands of light years across).

Wherever the interstellar clouds of the two galaxies collide, they do not freely move past each other without interruption but, rather, suffer a damaging collision.

Nikola Tesla in the Colorado Springs lab recorded cosmic waves emitting from interstellar clouds and red giant stars. He observed repeating signals conducted by his transciever. He announced that he received extraterrestrial radio signals.

This assumes that initially there is a dense interstellar cloud 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 solar wind blows a bubble in space inside the ambient interstellar medium, or partially ionized gas of the small local interstellar cloud that the sun travels through.

A nebula is an interstellar cloud 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.

An interstellar cloud 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.

molecular cloud A cold, dense interstellar cloud which contains a high fraction of molecules.

The Lagoon Nebula, or Messier 8 (NGC 6523), is a large interstellar cloud, 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.

Within this wind, dust particles (crucial to the development of interstellar clouds and, eventually, protoplanetary systems) are formed from carbon material dredged up from the core by convection currents.

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 Interstellar Cloud (or Local Fluff), ...

Immediately surrounding our solar system is a warm, partly ionized cloud, called the Local Interstellar Cloud. Like most interstellar clouds, its gas comprises about 90% hydrogen and 10% helium. Roughly 1% of the cloud's mass is dust.

Dark Nebula - A dense, interstellar cloud containing enough gas and dust to block the light of background stars. The dimming of background stars gives the appearance of a region with no stars ...

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

gravitational collapse
When a massive body collapses under its own weight. (For example, interstellar clouds collapse to become stars until the onset of nuclear fusion stops the collapse.)
gravitational radius
See event horizon.

1. How does the temperature of an interstellar cloud affect its ability to form stars?

Since I was a kid I read that we can't see the center due to dark interstellar clouds. Though they've now detected the effects of the massive black hole there.

The intrinsic composition of interstellar clouds, 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.

SWAS measured the amount of water and molecular oxygen in interstellar clouds, and also the amounts of carbon monoxide and atomic carbon, which are believed to be major reservoirs of carbon in these clouds.

SWAS will, for the first time by direct observation, measure the amount of water and molecular oxygen in interstellar clouds.

This cluster is behind a huge interstellar cloud 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.

Definition: spectroscopy: 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 interstellar clouds.

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 interstellar cloud.

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 interstellar clouds).

Spectroscopy is an important part of studying the chemistry that goes on in stars and in interstellar clouds. spectrum (NASA SP-7, 1965) 1. In physics, any series of energies arranged according to wavelength (or frequency).
2.

See also: See also: Astro, Solar, Sun, Planet, Star

Astronomy  Interferometry  Interstellar Gas
04/21/2014

 
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