Tossup

Bodies contained in these objects are analogized to cars moving through a traffic jam in a common explanation of a theory resolving their “winding problem.” Lin (10[1])and Shu’s density wave theory describes these objects, (10[1])which contain the majority of HII (“H two”) regions. The intrinsic luminosity of these objects is proportional to their asymptotic rotation velocity by the Tully-Fisher relation. (10[1]-5[1])Both prongs (10[1])of Hubble’s (10[1])“tuning fork” diagram contain these objects, (10[1])some of which are barred. The central bulges of these objects contain supermassive black holes. (10[3])For 10 points, name these disk-shaped systems (-5[1])of stars, gas, and dark matter, exemplified by Andromeda and the Milky Way. ■END■ (10[2]0[1])

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