What are the very cold (about 20 K), dense clouds of gas thought to be the most massiveobjects in the Galaxy called?

Question

Quizplus · Accepted Answer

Molecular clouds are very cold (about 20 K) and dense clouds of gas. They are thought to be the most massive objects in the Galaxy and are where new stars are born. Dense clouds of gas at about 20 K are typically molecular clouds, and they are thought to be the most massive objects in the Galaxy due to their large sizes and amounts of material.

What Are the Very Cold (About 20 K), Dense Clouds