Gravitational waves are created when two black holes orbit each other and merge.In April 2019, the scientists at the Event Horizon Telescope Project released the first-ever image of a Black Hole (more precisely, of its shadow).
The photos were obtained by an international team using the Event Horizon Telescope (EHT) a planet-wide network of. These range from hundreds of thousands to billions of times that of the sun from the Solar system to which Earth belongs. Scientists had to literally chase shadows in deep space to get a close look at the black hole a collapsed star from which not even light can escape because of its incredible gravity.
The other category is of supermassive black holes. These are thought to form when massive stars die. One category ranges between a few solar masses and tens of solar masses. Usually, the black holes belong to two categories:. Radio transmissions indicating its existence were first discovered by Karl Jansky.Tourist Beacon 0082, 'The Centre' Sagittarius A, officially abbreviated as Sgr A and colloquially as SagA, is the system in the Galactic Centre region. It is a supermassive black hole of the type found in most spiral and elliptical galaxies. 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. Sagittarius A is a popular destination for explorers and travellers. In 2019, the Event Horizon Telescope made history by releasing the first ever image of a black hole Messier 87 (M87) – the black hole at the centre of a galaxy M87, which is a supergiant elliptic galaxy. The researchers said that imaging Sagittarius A*, the black hole at the centre of the Milky Way, was much more difficult than imaging M87. It strengthens Einstein’s general theory of relativity that a point in space where matter is so compressed as to create a gravity field from which even light cannot escape. It is 4 million times more massive than our sun. It is near the border of Sagittarius and Scorpius constellations. 
This image of the black hole referred to as Sagittarius A* (Sagittarius A(asterisk)) gave further support to the idea that the compact object at the centre of our galaxy is indeed a black hole. Researchers called the black hole “ the gentle giant in the centre of our galaxy”. (Note, the equation for T is based on circumference/velocity where circ2 and v where replaces what would normally be r). Nearly all galaxies have these giant black holes at their centre, where light and matter cannot escape, making it extremely hard to get images of them. In both cases, the spin parameter is calculated to be a/M0.65 in order to match the orbit periods (T), as per fig. Recently, Scientists from the Event Horizon Telescope (EHT) facility, revealed the first image of the black hole named Sagittarius A* at the centre of our galaxy - the Milky Way.
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