- February 20, 2022
- Posted by: OptimizeIAS Team
- Category: DPN Topics
TOPIC: Science & Tech
Context- The supermassive black hole at the centre of the Milky Way, which has a mass 4 million times greater than the Sun, is observed.
- Observations showing a roughly dough-nut-shaped cloud of cosmic dust and gas shrouding a supermassive black hole at the centre of galaxy Messier 77 similar in size to our Milky Way.
About Black Holes:
- Black holes are extraordinarily dense objects possessing gravitational pulls so powerful even light cannot escape them.
- It refers to a point in space where the matter is so compressed as to create a gravity field from which even light cannot escape.
- The concept was theorized by Albert Einstein in 1915 and the term ‘black hole’ was coined in the mid-1960s by American physicist John Archibald Wheeler.
- The black holes belong to two categories:
- One category ranges between a few solar masses and tens of solar masses. These are thought to form when massive stars die.
- The other category is of supermassive black holes. These range from hundreds of thousands to billions of times that of the sun from the Solar system to which Earth belongs.
- Messier 77, also called NGC 1068 or the Squid Galaxy, is located 47 million light years – the distance light travels in a year, 9.5 trillion km – from the Earth in the constellation Cetus.
- Its supermassive black hole has a mass roughly 10 million times greater than our sun.