The universes most acurate time clock, a pulsar.
Either a black hole, or a neutron star. That depends on how much mass is left after the supernova explosion.
It is yes
No, not a supernova.
it is Supernova
The core of a star left over from a supernova explosion is called a neutron star. Neutron stars are incredibly dense, composed mostly of neutrons, and have strong gravitational and magnetic fields. They can be very small in size but contain a mass greater than that of our Sun.
supernova
it is a steller explosion
Supernova
SuperNova
A supernova.
The energy output of a supernova explosion is equivalent to the energy produced by the sun over its entire lifetime.
A supernova is not a celestial body in itself, but rather an astronomical event where a star suddenly increases greatly in brightness due to an explosive burst of energy. It is the result of the death of a massive star.