Multiple Choice
The spiral arm structure of the Milky Way Galaxy has been measured and evaluated most effectively by observations of
A) Lyman UV radiation from hot hydrogen gas.
B) observations of globular clusters in the halo of the Galaxy.
C) 21-cm radiation from interstellar hydrogen and the positions of young stars.
D) Balmer emission lines of visible radiation from hydrogen.
Correct Answer:
Verified
Correct Answer:
Verified
Q4: What atomic transition occurs in atoms of
Q5: Harlow Shapley's original estimate of the distance
Q6: What fraction of the mass of our
Q7: We cannot see the precise shape of
Q8: In the halo of the Galaxy,there are
Q10: When we measure the narrow line emissions
Q11: If the galactic center is now thought
Q12: Recent observations suggest that the Milky Way
Q13: Much of the mass of our Galaxy
Q14: Which of the following locations in our