Black holes and neutron stars are both the final states of a star in its life cycle. Black holes are formed from massive stars (mass more than 3 times our Sun) after the supernova phase. A black hole is characterized by a singularity and an event horizon. All the matter of the black hole is squeezed into a singularity (region of very, very high density), surrounded by a region of extremely high gravity, known as...
Black holes and neutron stars are both the final states of a star in its life cycle. Black holes are formed from massive stars (mass more than 3 times our Sun) after the supernova phase. A black hole is characterized by a singularity and an event horizon. All the matter of the black hole is squeezed into a singularity (region of very, very high density), surrounded by a region of extremely high gravity, known as the event horizon. Anything that crosses the event horizon will be sucked into the singularity. Not even the light can escape the gravity of the black hole and hence they are invisible. Black holes are detected by the motion of objects around them or when they strip matter and gases from their neighbors.
Neutron stars are made from stars that have also have a mass of more than 3 times that of our Sun. They are formed after a supernova explosion and consist of mostly neutrons, hence the name. They have a very high density and gravity, but not as large as that of a black hole. There is no singularity or event horizon of a neutron star. They do not emit any light and hence are very dim. They are detected either as radio sources (pulsars) or when they strip matter and gases from neighboring stars.
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