Author Question: Only type O stars are hot enough to show ionized ________ in their spectra. Fill in the blank(s) ... (Read 95 times)

colton · **on:** Jul 27, 2018

Only type O stars are hot enough to show ionized ________ in their spectra.

Fill in the blank(s) with correct word

Question 2

For finding the distances to globular clusters, Harlow Shapley used

A) RR Lyrae variables.
B) planetary nebulae.
C) eclipsing binaries.
D) Population I classical Cepheids.
E) Type I supernovae.