What does a large cloud of gas and dust called?
A nebula is a large cloud that consists of dust and gas. Their massive size can be as wide as a trillion miles. A huge release of gas in the interstellar medium produces the nebula. Clouds of dust and gas in space are called nebulae, singular nebula.
Are clouds made of gas and dust?
The Short Answer: Clouds are created when water vapor, an invisible gas, turns into liquid water droplets. These water droplets form on tiny particles, like dust, that are floating in the air. A camera on NASA’s Terra satellite captured this image of clouds over the Southern Indian Ocean. Image credit: NASA/JPL-Caltech.
What is a dark interstellar cloud?
molecular cloud, also called dark nebula, interstellar clump or cloud that is opaque because of its internal dust grains. The form of such dark clouds is very irregular: they have no clearly defined outer boundaries and sometimes take on convoluted serpentine shapes because of turbulence.
What is a cloud of interstellar gas held together by?
A cloud of interstellar gas is held together by. the gravitational force. A spinning cloud of interstellar gas tends to. flatten. How long does it take for Earth to revolve around the Sun? one week. The best evidence that the Sun is a newcomer in the universe is.
What is the name of a interstellar cloud?
molecular cloud, also called dark nebula, interstellar clump or cloud that is opaque because of its internal dust grains. The form of such dark clouds is very irregular: they have no clearly defined outer boundaries and sometimes take on convoluted serpentine shapes because of turbulence.
What is 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 supplies the raw material for star formation.
What is an immense cloud of gas and dust in interstellar space?
Nebulae are essentially clouds of gas and dust that make up higher density regions of the interstellar medium. Most nebulae are incredibly large in size and can be up to hundreds of light-years in diameter!
What are the different types of interstellar clouds?
The interstellar clouds belong to four different classes: diffuse atomic, diffuse molecular, translucent, and dense molecular (Snow & McCall, 2006) . The size of these clouds vary from a few to hundreds of light-years and are composed of gas (∼ 99% by mass) and a tiny fraction of dust (∼ 1% by mass) particles. ...
What do we mean by a Protogalactic cloud?
What do we mean by a protogalactic cloud? a cloud of hydrogen and helium that contracts to become a galaxy.
What does gas and dust in interstellar nebulae form?
In some places, the interstellar medium is collected into a big cloud of dust and gas called a nebula. A nebula can be many light years across. It is in these nebulae that dust and gas can come together to form stars. A star is not truly a star until it can fuse hydrogen into helium.
What is a cloud of dust and gas in space?
A nebula is an enormous cloud of dust and gas occupying the space between stars and acting as a nursery for new stars. The roots of the word come from Latin nebula, which means a “mist, vapor, fog, smoke, exhalation.” Nebulae are made up of dust, basic elements such as hydrogen and other ionized gases.
What are dust and gas clouds?
A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form.
What kind of cloud of gas and dust is most likely to collapse and form stars quizlet?
A cloud of gas and dust is a Nebula (plural - Nebulae). Star forming nebulae are cold, dense, and dark. Gravity causes the densest parts to collapse, forming regions called protostars.
Are there gas clouds in space?
An interstellar cloud is generally an accumulation of gas, plasma, and dust in our and other galaxies. Put differently, an interstellar cloud is a denser-than-average region of the interstellar medium (ISM), the matter and radiation that exists in the space between the star systems in a galaxy.
What is interstellar dust made of?
Interstellar dust is made of compounds of various elements such as oxygen, carbon, iron, silicon and magnesium. It originates from the death of stars where stars during their lifetime create metals and explode at their end or blow off their outer layers.
What are gas clouds?
A gas cloud is a small pocket of floating gas that forms in certain regions; its type of gas depends on its current location.
What is in interstellar gas?
The interstellar medium is filled primarily with hydrogen gas. A relatively significant amount of helium has also been detected, along with smaller percentages of such substances as calcium, sodium, water, ammonia, and formaldehyde. Sizable quantities of dust particles of uncertain composition are present as well.
What is interstellar dust made of?
Interstellar dust is made of compounds of various elements such as oxygen, carbon, iron, silicon and magnesium. It originates from the death of stars where stars during their lifetime create metals and explode at their end or blow off their outer layers.
Why did the interstellar gas and dust collapse?
Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction.
Where does interstellar gas come from?
The interstellar gas is typically found in two forms: Cold clouds of neutral atomic or molecular hydrogen; and. Hot ionized hydrogen near hot young stars.
Overview
An interstellar cloud is generally an accumulation of gas, plasma, and dust in our and other galaxies. Put differently, an interstellar cloud is a denser-than-average region of the interstellar medium (ISM), the matter and radiation that exists in the space between the star systems in a galaxy. Depending on the density, size, and temperature of a given cloud, its hydrogen can be neutral, making an H I region; i…
Chemical compositions
The chemical composition of interstellar clouds is determined by studying electromagnetic radiation or EM radiation that they emanate, and we receive – from radio waves through visible light, to gamma rays on the electromagnetic spectrum – that we receive from them. Large radio telescopes scan the intensity in the sky of particular frequencies of electromagnetic radiation which are characteristic of certain molecules' spectra. Some interstellar clouds are cold and ten…
Unexpected chemicals detected in interstellar clouds
Until recently the rates of reactions in interstellar clouds were expected to be very slow, with minimal products being produced due to the low temperature and density of the clouds. However, organic molecules were observed in the spectra that scientists would not have expected to find under these conditions, such as formaldehyde, methanol, and vinyl alcohol. The reactions needed to create such substances are familiar to scientists only at the much higher temperatures and pr…
High-velocity cloud
These interstellar clouds possess a velocity higher than can be explained by the rotation of the Milky Way. By definition, these clouds must have a vlsr greater than 90 km s , where vlsr is the local standard rest velocity. They are detected primarily in the 21 cm line of neutral hydrogen, and typically have a lower portion of heavy elements than is normal for interstellar clouds in the Milky Way.
See also
• List of molecules in interstellar space
• Nebula
• Interplanetary medium – interplanetary dust
• Interstellar medium – interstellar dust
External links
• High Velocity Cloud — The Swinburne Astronomy Online (SAO) encyclopedia.