What happens to a photon as it approaches a neutron star?

Will it be "captured" by it, or just appear to "slow" down to an observer watching it?



How much more gravitational energy does a black hole have compared to a neutron star? Infinitely more? But that does not make sense.What happens to a photon as it approaches a neutron star?Photons by definition are considered mass less.Gravitational mass attract smaller masses. A Star having a large gravitational mass would attract a Proton or an electron which are particles with mass.
So a photon, defined as being mass less , would not be attracted to a gravitational mass.
There is no way that an observer can see a photon approaching the Star because its defined as mass less.

Gravitational energy is proportional to the mass content inside the volume a celestial object. The gravitational pressure holding a Star together is equal to the product of the Gravity Energy and the curvature of space surrounding the Star.