What are Quasars?

About Quasars:

• The quasi-stellar radio sources (Quasars) were first discovered six decades ago.
• These are very luminous objects in faraway galaxies that emit jets at radio frequencies.
• They are located in supermassive black holes, which sit in the centre of galaxies.
• These are formed by the energy emitted by materials spiralling around a black hole right before being sucked into it.  
• Most quasars are larger than our solar system. A quasar is approximately 1-kilo parsec in width.
• When galaxies collide, it pushes the gas from the outer reaches of the galaxies to the centre.
• As the supermassive black hole gorges on the gas, it releases ferocious fountains of energy in the form of radiation, leading to the quasar.

What is a Blackhole?

• A black hole is an area in space with extremely intense gravity from which even light cannot escape. 
• A black hole can be formed by the death of a massive star.
• Examples of a black hole are Cygnus X-1 and Sagittarius A*