EXERCISE 19


(a) A typical white dwarf has a diameter about that of Earth, and has a mass
about that of the Sun.  What is the approximate density of a white dwarf? 
What is the mass of a teaspoon (about 5 cubic cm) of white dwarf star material?

(b) A typical neutron star has a diameter of about 20 km, and has a mass about
1.4 times that of the Sun.  What is the approximate density of a neutron star?
What is the mass of a teaspoon (about 5 cubic cm) of neutron star material?

(c) How many elephants would you have to fit into a thimble to match the
density of a neutron star?  How much neutron star material would have a mass
equal to all of humanity put together?