Question

What are pulsars ?

Answer 1

Hint: Pulsars are very valuable instruments for astronomy because of their periods. The presence of gravitational radiation was partially confirmed by observations of a pulsar in a binary neutron star system. Around the pulsar PSR B1257+12, the first extrasolar planets were discovered. Certain forms of pulsars were discovered in 1983, and their precision in holding time at the time surpassed that of atomic clocks.

Complete answer:
A pulsar is a spinning small star with strongly magnetised magnetic poles that releases rays of electromagnetic radiation. Pulsars are typically neutron stars, but they may also be white dwarfs. This radiation is responsible for the pulsed presence of emission which can only be detected when a ray of emission is pointing toward Earth (similar to how a lighthouse can only be seen when the light is pointed in the direction of an observer). Neutron stars are dense and rotate with brief, frequent intervals. For each pulsar, this results in a very specific time between pulses ranging from milliseconds to seconds. Pulsars are one of the possible sources of very high-energy cosmic rays.
Pulsars are very valuable instruments for astronomy because of their periods. The presence of gravitational radiation was partially confirmed by observations of a pulsar in a binary neutron star system. Around the pulsar PSR B1257+12, the first extrasolar planets were discovered. Certain forms of pulsars were discovered in 1983, and their precision in holding time at the time surpassed that of atomic clocks.
Additional Information
Quasars:
A quasar is an incredibly bright active galactic nucleus (AGN) containing a supermassive black hole surrounded by a gaseous accretion disc with a mass ranging from millions to billions of times that of the Sun. Energy is emitted in the form of gravitational radiation when gas in the disc sinks into the black hole, which can be seen through the electromagnetic spectrum. Quasars radiate immense amounts of energy; the more strong quasars have luminosities thousands of times greater than the Milky Way. Quasars are usually classified as a subcategory of the more general group of AGN. The root of quasar redshifts is cosmological.
Quasars can be found over a wide variety of distances, and quasar detection surveys have shown that quasar occurrence was more prevalent in the past. About 10 billion years ago, quasar activity was at its height.

Note:
Quasars can be found over a wide variety of distances, and quasar detection surveys have shown that quasar occurrence was more prevalent in the past. About 10 billion years ago, quasar activity was at its height.