Contrast the densities of the terrestrial planets and comets. ...

[future617RT]

Contrast the densities of the terrestrial planets and comets.
 
  What will be an ideal response?

Question 2

Which statement about pulsars is not thought to be true?
 
  A) All pulsars are neutron stars, but not all neutron stars are pulsars.
  B) Pulsars can form only in close binary systems.
  C) A pulsar must have a very strong magnetic field and rotate quite rapidly.
  D) Pulsars are kept from collapsing by neutron degeneracy pressure.

[bob]

Answer to Question 1

Forming close to the Sun, terrestrials are denser, with iron and silicates as major components. Far out beyond the ice limit, the jovians are far less dense, with compositions much like the gases of the Sun.

Answer to Question 2

B