### Question --- What is the gravitational redshift from the surface of a neutron star? ### Answer --- ![[Redshift#Gravitational Redshift]] For photon being emitted from the surface of a [[Neutron Star|neutron star]] ($r = R_{\rm NS}$), we can use the [[Neutron Star#^typical-parameters|typical parameters]] for a neutron star to evaluate the redshift to be... $z \sim 0.3 \hspace{1cm} {\rm for} \hspace{1cm} M = 1.4 \; {\rm M_{\odot}} , \; R = 10 \; {\rm km}$