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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: Dust and gas existing between stars.
Interstellar planet (also known as Rogue planet, Nomad planet or Orphan planet): A planet, dwarf planet or larger moon that has been ejected from its system and is no longer gravitationally bound to any star, ...

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

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 extinction - (n.) ...

"Interstellar clouds 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.

An interstellar cloud of dust reflecting light from hot young stars can be seen toward the left edge of this picture. This area comprises three regions known as NGC 1977, NGC 1975, and NGC 1973.
To see more amazing night sky photos submitted by Space.com readers, visit our astrophotography archive.

An interstellar cloud of molecular hydrogen containing trace amounts of other molecules such as carbon monoxide and ammonia.
Incorporated association 41059 (QLD)
Designed by DP Technologies.

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).

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.
HII region: A region of ionized hydrogen around a hot star.

A nebula is an interstellar cloud of gas and dust. A dark nebula is a nebula with a relatively dense concentration of microscopic dust grains, which scatter and absorb light very efficiently. The Horsehead Nebula in the constellation of Orion is a very good example of a dark nebula.

Dark cloud An interstellar cloud of gas and dust that contains enough dust to blot out the light of stars behind it (as seen from the Earth). Deep Space Network A NASA radio navigation network used to communicate with spacecraft beyond Earth's orbit.

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. Unbound gravitationally, associations, unlike clusters, expand away into the Galaxy.

The electric force is so much stronger than gravity that ionized interstellar clouds have almost no net charge on large scales; the charges of all free electrons in an ionized cloud are balanced by the charges of positively ions.

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, many of which will end their brief lives violently as supernovae.

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.

The average vacuum that I can create a teaching lab that is good at blowing up balloons that don't appear to have any air in them is less of a vacuum than many interstellar clouds. So you compare interstellar cloud, filled with amino acids, vacuum in lab, the cloud isn't as dense.

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.

In the infrared, certain lines can be used to map the distribution of star forming regions and cool interstellar clouds throughout our galaxy. For example, the 2 images below show all sky maps of the intensity of C+ (ionized carbon) and N+ (ionized nitrogen) from the COBE satellite.

O stars, plus those of classes B0 to B1, produce much of the ionizing radiation that energizes the thinner interstellar clouds. Their high mass-loss rates also return a great deal of matter to the interstellar medium (red giant winds and planetary nebulae producing the bulk).

An interstellar cloud or a stellar (or even planetary) atmosphere plays the role of the intervening cool gas; and a spectrograph attached to a telescope replaces our simple prism and detector.

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; diffuse nebulae are often associated with star forming regions in which the force of gravity collapses the cloud into clumps and knots, ...

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). Consider a portion of the cloud the collapses from a size of a light year or so to the size of the solar system.

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 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 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.

- Dark nebulae are dense interstellar clouds 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 interstellar cloud 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.

Bok globule is small interstellar clouds of very cold gas and dust that are thick. Because of the thickness, they are totally opaque to visible light; however, they can be studied using infrared and radio techniques.
Bolide is a fireball. A large brilliant meteor that explodes.

Emission Nebula
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. Examples include the Orion and Lagoon nebulas.

Nebulae - they are huge interstellar clouds 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 interstellar cloud 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 Interstellar Cloud. Like most interstellar clouds, 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 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.

Free-free Emission: The emission of radio waves from interstellar clouds as electrons momentarily bind with ionized atoms, and then move on to other atoms.
Frequency: Number of wave vibrations per second; 1 Hertz is one cycle per second (e.g., 1420 MHz = 1,420,000,000 vibrations per second).

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), ...

Molecular Cloud - A relatively dense, cool interstellar cloud 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 interstellar clouds 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 interstellar clouds. 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" ...

Local space is dominated by an open cluster called the Sparks (IC 4756) approximately 50 lightyears away and a small dark interstellar cloud called The Tatter. Most local civilisations have been founded or influenced by various clades that originated from the Gerkletoss culture.

Binary stars are twins in the sense that they formed together out of the same interstellar cloud.

Black Hole: An object thought to be the result of a massive star's implosion in which its gravity has become so dense and strong that it prevents light from escaping.

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

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.

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 interstellar clouds, 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 interstellar clouds. 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 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.

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.

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.

In its travels from the Orion region it encountered the interstellar cloud of gas and dust we know now as IC 405. Hydrogen within the cloud emits red light as its electrons become stripped by AE Aurigae's ultraviolet radiation.

Molecules such as acetic acid and formaldehyde have been discovered in interstellar clouds 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 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: What is the meaning of Interstellar, Astro, Star, Sun, Solar?

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