Quasars and pulsars are two of the most energetic and extreme objects in the universe, acting as cosmic beacons visible across vast distances. While both are high-energy astronomical phenomena, they originate from very different astrophysical processes.

Quasar – Celestial Objects, Active Galactic Nuclei, High-Energy Astrophysics - A quasar (quasi-stellar object) is an extremely luminous active galactic nucleus (AGN) powered by a supermassive black hole at the center of a distant galaxy. As matter falls into the black hole's accretion disk, it releases immense amounts of radiation across the electromagnetic spectrum, often outshining the entire host galaxy. Quasars are among the most energetic objects in the universe and provide key insights into galaxy evolution, black hole growth, and the early universe. They are often used as cosmic beacons to study intergalactic matter and the large-scale structure of the cosmos.

Pulsar – Celestial Objects, Neutron Stars, High-Energy Astrophysics - A pulsar is a rapidly rotating neutron star that emits beams of electromagnetic radiation from its magnetic poles. As the pulsar spins, these beams sweep across space, appearing as periodic pulses when observed from Earth. Pulsars are highly magnetized remnants of supernova explosions and serve as cosmic laboratories for studying gravitational physics, quantum mechanics, and extreme states of matter. Some pulsars, known as millisecond pulsars, spin at thousands of revolutions per second, while others—magnetars—have ultra-strong magnetic fields that power high-energy emissions. Pulsars are crucial for testing general relativity, detecting gravitational waves, and exploring the nature of dense stellar remnants.