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 2
Opacity 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.
Galaxy
the comet Encke riding along its pebbly trail of debris (long diagonal line) between the orbits of M
Planets and Their Stars
Elliptical Galaxies
As the world’s population continues to grow, demands on limited resources for food production
A particle confined in a rigid one-dimensional box (an infinite well) of length 17.0 fm has an ...