1. What is the difference between an Sa and an Sb galaxy? a. The Sa galaxy has a
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Question
1. What is the difference between an Sa and an Sb galaxy?
a. The Sa galaxy has a larger nuclear bulge.
b.The spirals of the Sb galaxy are more tightly wound.
c. both of these
d. none of these
2. What is the difference between an S0 and an Sa galaxy?
a. The Sa galaxy has hot, bright stars.
b. The S0 galaxy has no visible gas.
c. both of these
d. none of these
3. What is the difference between an Sb and an SBb galaxy?
a. The Sb galaxy has more hot, bright stars and less gas.
b. The SBb galaxy has an elongated nucleus.
c. both of these
d. none of these
4. What is the difference between an E7 and an S0 galaxy?
a. The S0 galaxy has a nuclear bulge.
b. The E7 galaxy has no visible gas or dust.
c. both of these
d. none of these
Explanation / Answer
1.a. The Sa galaxy has a larger nuclear bulge.
2.b. The S0 galaxy has no visible gas.
3d. none of these
4d. none of these
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