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Biology, 19.11.2019 22:31 goforthmusic235

What is the main difference between a spiral galaxy and a barred spiral galaxy?

a. whether it has barred arms of stars surrounding the nucleus

b. whether there are bars of dark matter stretching across the galaxy

c. whether it has a central "bar" of stars rather than a rounded nucleus

d. whether there are barred sections of the halo, which do not form spirals

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