Question

the _____ classification of spiral galaxies have smaller nuclei and more relaxed spiral arms compared to the _____ classification of spiral galaxies.
○ e2
e3
○ e3
sc
○ sa
e2
○ sc
sb
○ irr
sa

question 11
1 pts
why doesnt hubbles law apply to nearby galaxies?
○ hubbles law applies to all galaxies.
○ all nearby galaxies are elliptical in morphology, and hubbles law only works for spiral galaxies.
○ the speed of nearby galaxies is affected by gravitational interaction with one another.
○ due to the difficulty in acquiring spectroscopic data from nearby galaxies compared to more distant galaxies.

Explanation:

For the first question, the Hubble sequence classifies spiral galaxies as Sa (large nucleus, tight arms), Sb (medium nucleus/arms), Sc (small nucleus, relaxed arms). E types are elliptical, not spiral. So Sc has smaller nuclei and more relaxed arms than Sa. For the second question, Hubble's Law describes cosmic expansion (recession velocity ∝ distance), but nearby galaxies have significant gravitational interactions (e.g., Milky Way and Andromeda) that override expansion effects, making the law inapplicable.

Answer:

First blank: Sc, Second blank: Sa
The speed of nearby galaxies is affected by gravitational interaction with one another.