diffuse cloud

diffuse cloud

A small atomic (H I) cloud that has too low a column density for it to be observed visually. Diffuse clouds constitute the bulk of the cold neutral medium in the three-phase description of the interstellar medium. They are usually observed by means of absorption features, such as the sodium D lines, in the spectra of background stars.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
When using the approach on the L5 point, the researchers found exactly what they were looking for - a diffuse cloud of tiny particles.
It's a diffuse cloud where stars are forming at a fast pace and where there are a lot of globulettes, some smaller than the mass of Jupiter.
The supernova remnants are embedded inside a huge, diffuse cloud of charged particles, or plasma, which absorbs radio waves from these sources.
Davies, "An upper limit on anomalous dust emission at 31 GHz in the diffuse cloud [LPH96] 201.663+1.643," Astrophysical Journal, vol.
To attract international investment, Europe must become a "constellation of excellent research stars," not a "diffuse cloud of dull mediocrity".
I heard the voices of Sasha (2) and Serge as they entered the room; I saw in a diffuse cloud of shapes someone lifting what looked like a baseball bat and place it on my naked shins.
Outside this layer a more diffuse cloud of ions assembles to balance the charge.
As a result, once a rubidium atoms absorbs a photon, it swells up to such a size that no other atom in the diffuse cloud can accept any more photons.
Despite the star's glare, this diffuse cloud appears noticeably elongated.
They will tug on the Oort cloud, a diffuse cloud of icy objects around the solar system thought to be a reservoir of comets.
"It's primarily between 3,300 and 4,300 feet [below the surface] as a very diffuse cloud that is in concentrations that diminish as you go away from the wellhead," she said.
In my 10-inch at 116x the diffuse cloud appears bright along its northern edge near the two stars, but fades quickly along the fanlike southern portion.

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