What Makes Up the Interstellar Medium

Q31: What produces the 21-cm line that we

Q32: What observational evidence supports the galactic fountain

Q33: Most nearby stars move relative to the

Q34: Briefly explain why stars that formed early

Q35: What evidence supports the theory that there

Q37: If you could watch a time-lapse movie

Q38: Which of the following statements about the

Q39: What do we mean by a protogalactic

Q40: The Milky Way looks the same in

Q41: What kinds of objects lie in the