What are the immense, cold clouds of gas and dust where star genesis begins generally called?

Answer

Nebulae or giant molecular clouds

Star genesis begins in immense, cold clouds of gas and dust known as nebulae, or more specifically, giant molecular clouds. These clouds are predominantly composed of hydrogen and helium.

What are the immense, cold clouds of gas and dust where star genesis begins generally called?
Originstarlifecelestial body