After a protostar has progressed in its development, it will have a dense inner part and an outer envelope called a(n) ____.
A) outer-protostar
B) Bok globules
C) upper proto-sphere
D) cocoon nebulae
E) planetary nebulae

Question

Quizplus · Accepted Answer

A cocoon nebula is the outer envelope of gas and dust surrounding a developing protostar, which eventually dissipates as the star evolves.

After a Protostar Has Progressed in Its Development, It Will