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1. As far as an astronomer is concerned, a metal referstoA any elementB any element exceptHydrogenC any element exceptHeliumD any element exceptHydrogen and Helium
2. A spiral density wave refers to a region of enhanced density inthe Galaxy which rotates more slowly than the stars and gas.A TrueB False
3. Globular clusters in the halo of the Milky Way appear to havestars that are younger than open clusters in the disk of the MilkyWayA TrueB False
4. Population I and II stars differ in thatA population I starsare metal-poor and younger than population II stars.B population I stars aremetal-poor and older than population II stars.C population I stars aremetal-rich and older than population II stars.D population I stars aremetal-rich and younger than population II stars.
5. Where are the majority of older, metal-poor stars found in theMilky Way galaxy?A In globular clustersin the galactic halo.B Throughout the wholegalaxy.C In the disk and spiralarms.D At the galacticcenter.
6. The center of our Milky Way Galaxy can be observed most easilyat which of the following electromagnetic wavelengths?A Ultravioletradiation.B Infrared and radiowaves.C Visible light.D High-energy gammarays.
basic terminology click geometry in the upper left-hand view.airfoil the wing.leading edge the forward rounded part of
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