Which statement correctly compares the size, composition, and density of Neptune to Earth?
(1) Neptune is smaller, more gaseous,
and less dense.
(2) Neptune is larger, more gaseous,
and less dense.
(3) Neptune is smaller, more solid,
and more dense.
(4) Neptune is larger, more solid,
and more dense.

well, their are quite a few differences !

explanation:

first difference is a main sequence star is made of carbon, while a neutron star is made of neutrons. another difference is a main sequence star still has hydrogen to burn, while a neutron star is a remnant of a supernova.

a main sequence star is what’s left over from a low-mass star death, while a neutron star is what’s left from the death of a high-mass star. main sequence star and a neutron star are considered the same thing, except a main sequence star spins.