The Aryabhatta Research Institute of Observational Sciences (ARIES) in Nainital, Uttarakhand, houses the largest optical telescope in India, with a 3.6-meter primary mirror.

The GMRT, located near Pune, Maharashtra, is a radio telescope array primarily designed to observe radio waves emitted by distant galaxies, quasars, and other celestial objects.

The Kodaikanal Solar Observatory in Tamil Nadu is specifically designed to study the Sun, including its surface activity, magnetic fields, and solar flares.

The IAO in Hanle, Ladakh, primarily focuses on studying the Milky Way galaxy, including its structure, stellar populations, and interstellar medium.

The Tata Institute of Fundamental Research (TIFR) in Mumbai has made significant contributions to gamma-ray astronomy through its involvement in projects like the Major Atmospheric Gamma-ray Imaging Cherenkov Telescope (MAGIC).

The VBO in Kavalur, Tamil Nadu, is primarily dedicated to observing comets, asteroids, and other small bodies in our solar system.

The LIGO project, involving observatories in the United States and India, is dedicated to detecting gravitational waves, ripples in spacetime predicted by Einstein's theory of general relativity.

The INO, located in Theni, Tamil Nadu, is an underground laboratory designed to study the properties of neutrinos, subatomic particles that play a crucial role in understanding the universe.

The TIFR has made significant contributions to the study of cosmic rays, high-energy particles that originate from outside our solar system, through projects like the High Altitude Gamma Ray Experiment (HAGAR).

The NCRA in Pune, Maharashtra, primarily focuses on observing pulsars, neutron stars, and black holes using radio telescopes.

The ACT, located in the Atacama Desert in Chile, is a collaboration between several institutions, including the Indian Institute of Astrophysics, and is dedicated to studying the cosmic microwave background, the leftover radiation from the early universe.

The HCT, located in Uttarakhand, is a high-altitude optical telescope primarily used to observe distant galaxies, quasars, and other celestial objects.

The IIA in Bengaluru has made significant contributions to the study of exoplanets, planets outside our solar system, through projects like the Indian Exoplanet Transit Survey (IETS).

The IUCAA in Pune, Maharashtra, primarily focuses on observing supernovae, gamma-ray bursts, and other high-energy astrophysical phenomena.

The IIA in Bengaluru operates the Kodaikanal Solar Observatory, which includes specialized instruments for studying the Sun's corona, the outermost layer of its atmosphere.