The orbits of population I stars I. are confined to disk of the galaxy. II. are very elliptical. III. are nearly circular. IV. are randomly inclined to the disk of the galaxy.
a. I
b. IV
c. I & IV
d. II & IV
e. I & III
Question 2Opacity is
a. the balance between the pressure and force of gravity inside a star.
b. the force that binds protons and neutrons together to form a nucleus.
c. the force that binds an electron to the nucleus in an atom.
d. a measure of the resistance to the flow of radiation (photons) through a gas.
e. the temperature and density at which a gas will undergo thermonuclear fusion.
Question 3The nuclear bulge of our galaxy
a. contains stars that are primarily population I stars.
b. is primarily composed of gas and dust.
c. contains stars primarily associated with the spherical component of our galaxy.
d. contains stars primarily associated with the disk component of our galaxy.
e. contains stars that are primarily population I stars, is primarily composed of gas and dust, and contains stars primarily associated with the disk component of our galaxy.
Question 4_________ are small luminous nebulae excited by nearby young stars.
a. T Tauri stars
b. Herbig-Haro objects
c. O associations
d. Bok Globule
e. Giant molecular clouds
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