How Many Different Kinds of Molecules Have Been Discovered in Interstellar

Q42: Dark nebulae have temperatures around 10 K

Q43: The lowest mass that a protostar can

Q44: If a protostar of 1 M ?

Q45: What is the similarity in physical principle

Q46: The bright stars at the center of

Q48: A small emission nebula contains about how

Q49: What is the dominant spectral emission line

Q50: Protostars with masses of less than about

Q51: The blue color of a reflection nebula

Q52: The predominant color of an emission nebula