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I 15 the density wave theory explains how star

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i.15.The_density wave____theory explains how star formationis triggered in the spiral arms.j.16.The strong radio source at the center of our galaxy isknown as__Sagittarius A __.k.17.Why is radio light much better for observing the center ofthe galaxy than visible light?__with radio light, one can seethe density and other stuff hidden by dust. Especiallybecause of our viewpoint from Earth______l.18.What observational evidence do we have that there is asupermassive black hole at the center of our galaxy?__stars atthe very center are orbiting something invisible with themass of 4 million suns___.m.19.What are two observations that proved to be contradictionsof the monolithic collapse theory of the Milky Way’s formation?n.a._classical: collapse and cooling for starformation, Then a glob would form into a spiralgalaxy as matter is spread around ______.
o.b.__hierarchical: no sudden collapse just slow,cooling governed by feedback. Then disk systemscould combine to the galaxy _______.
p.20.Why are Cepheid variables so important to the study ofMilky Way Galaxy?__they are used as standard candles to measure distanceswithin our galaxy and nearby galaxies ___.
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Spring
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Staff
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Physics, grand design spiral galaxy

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