Interstellar cloud is the generic name given to 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. Depending on the density, size and temperature of a given cloud, the hydrogen in it can be neutral (H I regions), ionized (H II regions) (i.e. a plasma), or molecular (molecular clouds). Neutral and ionized clouds are sometimes also called diffuse clouds, while molecular clouds are sometimes also referred to as dense clouds.
Read more about Interstellar Cloud: Chemical Compositions, Unexpected Chemicals Detected in Interstellar Clouds, High-velocity Cloud
Famous quotes containing the word cloud:
“O months of blossoming, months of transfigurations,
May without cloud and June stabbed to the heart,
I shall not ever forget the lilacs or the roses
Nor those the spring has kept folded away apart.”
—Louis Aragon (1897–1982)