The Molecular cloud – It is an area of increased density of matter in the interstellar medium, which is characterized by almost complete opacity to visible light and ultraviolet light due to the fact that its molecular composition prevails. The main component of these clouds is hydrogen (H2) molecules, but more complex molecules are also present. According to research, the density of matter in a molecular cloud is 100-500 molecules per square meter. The temperature in the cloud is at a level of less than 100 K, and in its densest parts it is only 5-10 K.
The Molecular cloud
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