The event horizon is the boundary around a black hole from which nothing, not even light, can escape. It is the point of no return, where the gravitational pull of the black hole is so strong that nothing can overcome it.

Astrosat is India's first dedicated astronomy satellite, launched in 2015. It carries five instruments designed to study various aspects of the universe, including black holes, neutron stars, and other celestial objects.

Dr. Jayant Narlikar is an eminent Indian astrophysicist and cosmologist who played a significant role in the development of the X-ray Astronomy Experiment (XAE) on Astrosat. He is known for his contributions to the study of black holes and other astrophysical phenomena.

The primary goal of the XAE instrument on Astrosat is to study the X-ray emission from black holes and other compact objects, such as neutron stars and white dwarfs. X-rays are a powerful tool for probing the properties of these objects and understanding their behavior.

The Indian Space Research Organization (ISRO) is the national space agency of India. It is responsible for the development and launch of Astrosat and other Indian space missions.

The Tata Institute of Fundamental Research (TIFR) played a major role in the development of the Cadmium Zinc Telluride Imager (CZTI) instrument on Astrosat. TIFR is a premier research institute in India known for its contributions to various fields of science, including astrophysics and space instrumentation.

The primary function of the CZTI instrument on Astrosat is to detect gamma rays from astrophysical sources, such as black holes, neutron stars, and supernova remnants. Gamma rays are high-energy photons that can provide valuable insights into the behavior of these celestial objects.

Dr. Ashoka Singhal is an eminent Indian astrophysicist who led the team that developed the Soft X-ray Telescope (SXT) instrument on Astrosat. He is known for his contributions to the study of black holes and other astrophysical phenomena.

The main objective of the SXT instrument on Astrosat is to observe X-ray emission from black holes and neutron stars. X-rays are a powerful tool for probing the properties of these objects and understanding their behavior.

The Indian Institute of Astrophysics (IIA) played a significant role in the development of the Ultraviolet Imaging Telescope (UVIT) instrument on Astrosat. IIA is a premier research institute in India known for its contributions to various fields of astronomy and astrophysics.

The primary goal of the UVIT instrument on Astrosat is to observe ultraviolet emission from stars and galaxies. Ultraviolet light can provide valuable insights into the properties and evolution of these celestial objects.

Dr. Biswajit Paul is an eminent Indian astrophysicist who played a key role in the development of the Large Area X-ray Proportional Counter (LAXPC) instrument on Astrosat. He is known for his contributions to the study of black holes and other astrophysical phenomena.

The main objective of the LAXPC instrument on Astrosat is to detect X-rays from black holes and neutron stars. X-rays are a powerful tool for probing the properties of these objects and understanding their behavior.

The Indian Space Research Organization (ISRO) played a major role in the development of the Scanning Sky Monitor (SSM) instrument on Astrosat. ISRO is the national space agency of India and is responsible for the development and launch of Astrosat and other Indian space missions.

The primary function of the SSM instrument on Astrosat is to monitor the X-ray sky for transient events, such as X-ray bursts and flares from black holes and other compact objects.