Aryabhata, a renowned mathematician and astronomer from the 5th century CE, is widely regarded as the father of Indian astronomy. His contributions include the development of the Aryabhata system, which introduced the concept of zero and the use of decimal notation.

S. Chandrasekhar, an Indian-American astrophysicist, was awarded the Nobel Prize in Physics in 1983 for his theoretical studies of the physical processes of importance to the structure and evolution of stars. His work laid the foundation for the understanding of gravitational waves.

Aryabhata, named after the ancient Indian astronomer, was the first Indian satellite launched into space on April 19, 1975. It was designed to study X-ray astronomy and carried instruments to detect X-rays from celestial sources.

Govind Swarup, an Indian radio astronomer, discovered the first pulsar, PSR B1919+21, in 1967. This discovery marked a significant milestone in astrophysics, providing evidence for the existence of neutron stars.

The Indian Space Research Organization (ISRO) is the national space agency of India, responsible for space exploration, research, and development. It has played a pivotal role in India's space program and has achieved significant milestones in satellite technology, launch vehicle development, and planetary exploration.

S. Chandrasekhar, an Indian-American astrophysicist, made significant contributions to the study of black holes and gravitational singularities. His work on the Chandrasekhar limit, which determines the maximum mass of a white dwarf star, earned him the Nobel Prize in Physics in 1983.

The Himalayan Chandra Telescope (HCT) is a high-altitude gamma-ray telescope located in the Himalayas. It is designed to study high-energy gamma rays from celestial sources and contribute to the understanding of cosmic phenomena such as supernovae, active galactic nuclei, and gamma-ray bursts.

Homi J. Bhabha, an Indian nuclear physicist and cosmic ray researcher, made significant contributions to the study of cosmic rays. He established the Tata Institute of Fundamental Research (TIFR) in Mumbai, which became a hub for cosmic ray research in India.

Aditya-L1 is an Indian satellite mission planned to study the Sun. It will be placed in a halo orbit around the Lagrange point L1, which is located about 1.5 million kilometers from Earth in the direction of the Sun. Aditya-L1 will carry instruments to observe the Sun's corona, chromosphere, and photosphere.

Jayant Narlikar, an Indian astrophysicist and cosmologist, is known for his work on the origin and evolution of galaxies. He proposed the Hoyle-Narlikar theory, which suggests that the universe is continuously expanding and creating new matter.

Mangalyaan, also known as the Mars Orbiter Mission, was India's first interplanetary mission. It was launched in 2013 and successfully entered Mars' orbit in 2014. Mangalyaan studied the Martian atmosphere, surface, and mineralogy, providing valuable insights into the Red Planet.

Subrahmanyan Chandrasekhar, an Indian-American astrophysicist, made significant contributions to the study of the cosmic microwave background radiation (CMB). His work on the Chandrasekhar-Fermi limit helped establish the CMB as a powerful tool for understanding the early universe.

INSAT-3D is an Indian satellite designed to study the Earth's atmosphere. It carries instruments to monitor weather patterns, climate change, and natural disasters. INSAT-3D also provides data for various applications, including agriculture, forestry, and disaster management.

Abhay Ashtekar, an Indian-American theoretical physicist, is known for his work on black holes and gravitational waves. He developed the Ashtekar variables, which provide a new way to describe gravity and study the behavior of spacetime near black holes.

Chandrayaan was India's first lunar exploration mission. It was launched in 2008 and successfully entered lunar orbit in 2009. Chandrayaan carried instruments to study the Moon's surface, mineralogy, and composition. It also discovered water ice at the lunar poles.