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what are the compositions of interstellar clouds and why they appear as blotches of light and dark? ​

Sagot :

Answer:

Molecular cloud, also called dark nebula, interstellar clump/cloud is composed primarily of dust and gas. it 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.