a. Globular clusters
b. Neutron stars
c. Open star clusters
d. Very old stars
e. None of these are correct
What types of objects allow us to map the spiral arms of the galaxy?
Boy.... I'm not sure of any of these - I was going to say the hydrogen gas clouds, because radio mapping can read them in the 21-centimeter range...
Neutron stars, on the other hand, also emit regular pulsed singals, but... I would think they're too few %26amp; far between to see the structure of the arms... I think E - None are correct.
Reply:Please don't be another idiot coming to Y/A for homework help.
Reply:Molecular hydrogen clouds
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