As we progress in the Hubble classification sequence of spiral galaxies from types Sa to Sb to Sc, how do their physical characteristics change?

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    The central bulges stay the same, while the spiral arms become more tightly wound.
     The central bulges become larger, while the spiral arms become less tightly wound.
     The central bulges become smaller, while the spiral arms become more tightly wound.
     The central bulges become smaller, while the spiral arms become less tightly wound.
     The central bulges become larger, while the spiral arms become more tightly wound.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

0 votes
The central bulges become smaller, while the spiral arms become less tightly wound.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)



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