Q) what is a pulsar and neutron star?

pulsars are highly magnetized rotating neutron stars which emit a beam of electromagnetic radiation in the form of radio waves. Their observed periods range from 1.4 ms to 8.5 s. The radiation can only be observed when the beam of emission is pointing towards the Earth. This is called the lighthouse effect and gives rise to the pulsed nature that gives pulsars their name. Because neutron stars are very dense objects, the rotation period and thus the interval between observed pulses are very regular.

nuetron star

is a type of remnant that can result from the gravitational collapse of a massive star

rate if this is sensible