Author Question: For finding the distance to M31, Hubble relied upon A) planetary nebulae near its core. B) ... (Read 193 times)

theo · **on:** Jul 27, 2018

For finding the distance to M31, Hubble relied upon

A) planetary nebulae near its core.
B) Cepheid variables in its spiral arms.
C) Type I supernova in its core.
D) Type II supernova in its spiral arms.
E) RR Lyrae stars in its globular clusters.

Question 2

The brightest stars in aging globular clusters will be

A) blue supergiants like Rigel and Deneb.
B) massive blue main-sequence stars like Spica.
C) blue stragglers.
D) red supergiants like Betelgeuse and Antares.
E) core stars of planetary nebulae.