the atmospheres of red giant stars
Since interstellar clouds are most often overdensities in the interstellar medium, they have overwhelmingly similar chemical compositions - most of them (about 90%) being hydrogen, although this may be molecular, or ionized (plasma), with most of the remainder being helium. Heavier elements and compounds have been discovered spectroscopically in interstellar clouds, including more recently some unexpected light organic molecules.
Planet Earth formed from dust and gas in the solar nebula, not from drops of water. The dust and gas in the nebula gradually came together through a process called accretion, leading to the formation of larger and larger bodies that eventually became planets.
Red light passes most easily through interstellar clouds because it has the longest wavelength and lower energy, making it less likely to be absorbed or scattered by dust particles within the cloud. Blue and violet light, with shorter wavelengths and higher energy, are more likely to be scattered or absorbed.
The nebular hypothesis suggests that the interstellar dust within a nebular cloud is the most important component of planet formation. This theory proposes that gravitational forces cause the dust particles to collide and stick together, eventually forming planetesimals and then planets.
A large amount of gas and dust spread out in an immense volume is called a nebula. Nebulas are vast clouds of interstellar material where new stars are born.
Interstellar dust grains typically range in size from a few nanometers to hundreds of nanometers. They are composed of various materials such as silicates, carbonaceous material, and ices, and play a crucial role in the formation of planets and stars in space.
Since interstellar clouds are most often overdensities in the interstellar medium, they have overwhelmingly similar chemical compositions - most of them (about 90%) being hydrogen, although this may be molecular, or ionized (plasma), with most of the remainder being helium. Heavier elements and compounds have been discovered spectroscopically in interstellar clouds, including more recently some unexpected light organic molecules.
An interstellar cloud made of gas, dust, and plasma in a galaxy.
Interstellar gas and dust.
Interstellar absorption lines are thinner than stellar absorption lines because they are produced by relatively sparse gas and dust in the vast interstellar medium, while stellar absorption lines are produced by more dense and complex environments within a star's atmosphere. The broader stellar absorption lines can be influenced by a variety of factors such as temperature, pressure, and magnetic fields, leading to their wider appearance compared to interstellar lines.
A diffuse mass of interstellar dust and gas is known as a nebula. Nebulae are often regions where new stars are forming, as the dust and gas are the raw materials from which stars are born. They can vary in size, shape, and composition.
These are generically referred to as, not surprisingly; 'interstellar clouds'
One consequence of dust in the interstellar medium is causing reddening of starlight due to scattering and absorption.
Dust grains are better at scattering and absorbing visible light compared to gas molecules. The dust particles are larger and denser, causing them to block and scatter light effectively, making them more significant in obstructing visibility in the interstellar medium compared to the gas.
Interstellar dust
The answer is Nebular Theory
Cosmic dust, asteroidal dust, intergalactic dust, interstellar dust, comet dust, circumplanetary dust ~ it really depends on its astronomical location.