Cosmology Cosmology is the branch that involves the origin and evolution of the universe. It deals with formation of stars, galaxy etc. In the year , the existence of “gravitational waves” was discovered and noble prize was awarded for this discovery in the year . Gravitational waves are the disturbances in the curvature of space-time and it travels with speed of light.
Any accelerated charge emits electromagnetic wave. Similarly any accelerated mass emits gravitational waves but these waves are very weak even for masses like earth. Te strongest source of gravitational waves are black holes. Te discovery of gravitational waves made it possible to study the structure of black holes since it is the strongest source of gravitational waves.
In fact, the recent discoveries of gravitational waves are emitted by two black holes when they merge to a single black hole. In fact, Albert Einstein theoretically proposed the existence of ‘gravitational waves’ in the year . Afer years, it is experimentally proved that his predictions are correct. Black holes are end stage of stars which are highly dense massive object.
Its mass ranges from times mass of the sun to million times mass of the sun. It has very strong gravitational force such that no particle or even light can escape from it. Te existence of black holes is studied when the stars orbiting the black hole behave differently from the other stars. Every galaxy has black hole at its center.
Sagittarius A* is the black hole at the center of the Milky Way galaxy. Gravitational wave - - - - Unit Recent developments in physics Black hole sagittarus A* Te famous physicist Stephen Hawking worked in the field of black holes. Actual photograph of a super massive black hole M87* Super computers and eight telescopes stationed on five continents (EVENT HORIZON TELESCOPE) were used to develope a huge data to accomplish this. It has once again confirmed the Einstein’s theory of general relativity.
- - - - Unit Recent developments in physics (A scene